The cut-outs on the face of the Klima pan are 20.5mm x 20.5mm square designed for OEM or OEM-style 22.5mm "cube" switches. The placement of these holes are for out of reach switch mounting locations primarily for those that have either run out of room on the dash OR are looking for out-of-the-way switch mounts.
These square holes were never designed to work with the round temperature control switches from scheel-mann. This was done on purpose because we knew the location would be too awkward for controlling your seat temps but not awkward enough for random switch applications.
The best location for the round switches are either on the console or in the dash as you will need to have easy access but also need to be able to see what the current control state of the switch is.
Here you can see the cut-outs filled with aftermarket "cube-style" switches.