A method for assembling a data reader arrangement as shown in Figure 1 comprising: receiving a first data reader structure at an assembly location where a data reader arrangement is to be assembled, wherein the first data reader structure includes a first data reader; providing a chassis at the assembly location; forming a data reader arrangement at the assembly location by: matching a first indexing feature of the first data reader structure with a corresponding first indexing feature of the chassis; and attaching the first data reader structure to the chassis such that the first data reader structure extends upwardly from the chassis, wherein the first data reader is arranged in a first position at a first angular orientation, the first data reader spaced apart from and positioned above the chassis when the first data reader structure is attached to the chassis; receiving a second data reader structure at the assembly location, wherein the second data reader structure includes a second data reader, and wherein the step of forming a data reader arrangement further comprises: matching a second indexing feature of the second data reader structure with a corresponding second indexing feature of the chassis; and attaching the second data reader structure to the chassis such that the second data reader structure extends upwardly from the chassis, wherein the second data reader is arranged in a second position at a second angular orientation with respect to the chassis; and coupling a conveying element (31, 32) to the chassis of the data reader arrangement, wherein the conveying element is supported by the chassis; wherein the chassis includes a third data reader coupled to the chassis. receiving a first data reader structure at an assembly location where a data reader arrangement is to be assembled, wherein the first data reader structure includes a first data reader; providing a chassis at the assembly location; forming a data reader arrangement at the assembly location by: matching a first indexing feature of the first data reader structure with a corresponding first indexing feature of the chassis; and attaching the first data reader structure to the chassis such that the first data reader structure extends upwardly from the chassis, wherein the first data reader is arranged in a first position at a first angular orientation, the first data reader spaced apart from and positioned above the chassis when the first data reader structure is attached to the chassis; receiving a second data reader structure at the assembly location, wherein the second data reader structure includes a second data reader, and wherein the step of forming a data reader arrangement further comprises: matching a second indexing feature of the second data reader structure with a corresponding second indexing feature of the chassis; and attaching the second data reader structure to the chassis such that the second data reader structure extends upwardly from the chassis, wherein the second data reader is arranged in a second position at a second angular orientation with respect to the chassis; and coupling a conveying element (31, 32) to the chassis of the data reader arrangement, wherein the conveying element is supported by the chassis; wherein the chassis includes a third data reader coupled to the chassis. matching a first indexing feature of the first data reader structure with a corresponding first indexing feature of the chassis; and attaching the first data reader structure to the chassis such that the first data reader structure extends upwardly from the chassis, wherein the first data reader is arranged in a first position at a first angular orientation, the first data reader spaced apart from and positioned above the chassis when the first data reader structure is attached to the chassis; receiving a second data reader structure at the assembly location, wherein the second data reader structure includes a second data reader, and wherein the step of forming a data reader arrangement further comprises: matching a second indexing feature of the second data reader structure with a corresponding second indexing feature of the chassis; and attaching the second data reader structure to the chassis such that the second data reader structure extends upwardly from the chassis, wherein the second data reader is arranged in a second position at a second angular orientation with respect to the chassis; and coupling a conveying element (31, 32) to the chassis of the data reader arrangement, wherein the conveying element is supported by the chassis; wherein the chassis includes a third data reader coupled to the chassis. matching a second indexing feature of the second data reader structure with a corresponding second indexing feature of the chassis; and attaching the second data reader structure to the chassis such that the second data reader structure extends upwardly from the chassis, wherein the second data reader is arranged in a second position at a second angular orientation with respect to the chassis; and coupling a conveying element (31, 32) to the chassis of the data reader arrangement, wherein the conveying element is supported by the chassis; wherein the chassis includes a third data reader coupled to the chassis.