With the new feet, the distance to the base is only 1.5 mm in the area of the front panel. The distance to the left, right and back is 6 mm.
My original plan was to design the feet so that they could be attached with screws. But that only works with screws that have the right dimensions. In addition to the length, the diameter also has to be exactly right so that the pins that are inserted into the device are spread but do not break.
However, it is much easier to attach it using double-sided adhesive tape:
The file for self-printing can be obtained from Thingiverse.