I made this in Sketchup, using measurements taken from the original mount. The model fan/remote this mount comes from is a Mercator FRM87GL, though may be similar to other remote wall mounts you could use it for.

Basic part measurements are 35mm wide, 30mm tall. 1mm thick catch tab (with a radius of 5mm). 6mm thick at the top down to 2mm thick at the bottom.

Two 4mm holes with a 9mm countersink

Change or manipulate to suit your own application where needed.