A rack arrangement for a data center, comprising: an assembly frame comprising: a plurality of vertical beams extending vertically; a plurality of lateral beams connected to the vertical beams, each lateral beam of the plurality of lateral beams being connected between two of the vertical beams; and a plurality of transverse beams connected to the vertical beams, each transverse beam of the plurality of transverse beams being connected between two of the vertical beams, the transverse beams extending at least partly in a depth direction of the assembly frame; a rack-supporting platform connected between two of the lateral beams, the rack-supporting platform extending horizontally between four of the vertical beams; a plurality of racks supported by the assembly frame, each rack of the plurality of racks being configured to support computer equipment or cooling equipment for servicing the data center, the plurality of racks including: a first rack supported at least in part by two of the lateral beams of the assembly frame, the first rack comprising a first rack frame (112, 252) configured for supporting the computer equipment or cooling equipment; and a second rack disposed above the first rack and disposed atop the rack-supporting platform, the second rack comprising a second rack frame (112, 252) for supporting the least one of computer equipment or cooling equipment, the rack-supporting platform being supported in part by a top portion of the first rack such that a load of the second rack is at least partly applied on the first rack through the rack-supporting platform. an assembly frame comprising: a plurality of vertical beams extending vertically; a plurality of lateral beams connected to the vertical beams, each lateral beam of the plurality of lateral beams being connected between two of the vertical beams; and a plurality of transverse beams connected to the vertical beams, each transverse beam of the plurality of transverse beams being connected between two of the vertical beams, the transverse beams extending at least partly in a depth direction of the assembly frame; a plurality of vertical beams extending vertically; a plurality of lateral beams connected to the vertical beams, each lateral beam of the plurality of lateral beams being connected between two of the vertical beams; and a plurality of transverse beams connected to the vertical beams, each transverse beam of the plurality of transverse beams being connected between two of the vertical beams, the transverse beams extending at least partly in a depth direction of the assembly frame; a rack-supporting platform connected between two of the lateral beams, the rack-supporting platform extending horizontally between four of the vertical beams; a plurality of racks supported by the assembly frame, each rack of the plurality of racks being configured to support computer equipment or cooling equipment for servicing the data center, the plurality of racks including: a first rack supported at least in part by two of the lateral beams of the assembly frame, the first rack comprising a first rack frame (112, 252) configured for supporting the computer equipment or cooling equipment; and a second rack disposed above the first rack and disposed atop the rack-supporting platform, the second rack comprising a second rack frame (112, 252) for supporting the least one of computer equipment or cooling equipment, a first rack supported at least in part by two of the lateral beams of the assembly frame, the first rack comprising a first rack frame (112, 252) configured for supporting the computer equipment or cooling equipment; and a second rack disposed above the first rack and disposed atop the rack-supporting platform, the second rack comprising a second rack frame (112, 252) for supporting the least one of computer equipment or cooling equipment, the rack-supporting platform being supported in part by a top portion of the first rack such that a load of the second rack is at least partly applied on the first rack through the rack-supporting platform.