No, the configuration module is an option that is only needed for installations that require the trip points to be set to a value other than the factory settings, or for installations requiring a zero feet offset.
The installer may alter some of the operational characteristics of the KRA-405B by installing a CM-2000 that has been programmed with custom preferences. These preferences include the threshold altitudes for the 3 Altitude Trip Points and a selectable offset to be applied to all altitude outputs. If these parameters are inconsequential to the installation or the factory presets are acceptable, the CM- 2000 should not be installed with the KRA-405B.