I designed this simple bracket for mounting this access point. The tabs lock in to position solidly yet still easy enough to remove. The center cutout serves no purpose other that to reduce filament usage.

I printed the prototype using PLA which was perfectly fine for real world use. I printed the final product using PETG.

The base is 3mm thick, which i found to be about right - not too thick, but still strong enough.

Print with 15% infill

Bottom layers: 3

Top Layers: 4

Walls 8

I went with thick walls to provide strength around the screw holes as well as to print the tabs as solid.