This is a M5stack holder, written in OpenSCAD.

You can make your own wall holder for variable thick of the M5stack.

There are 3 screw holes for clamping holder to the wall.

You need to do is to set the total height of the M5stack units include modules on OpenSCAD source, render on OpenSCAD, and export STL.

There is a sample holder STL for 17.5mm height, it means only M5stack itself, without any modules.