I recently acquired a pair of EnGenius EWS850AP outdoor access points off an auction site. Unfortunately, they did not come with the original (metal) mounting brackets. Not to worry, I have OpenSCAD! (This bracket also fits the EWS850-FIT, which is the same hardware, just different firmware.)
You will need one M3x8mm screw to secure the AP to the bracket using the tab on the side.
I printed mine in Elegoo white Rapid PETG, 0.2mm layer height, 0.4mm nozzle, 15% infill.
The APs do run pretty hot, so time will tell if this holds up. (I have one mounted on the outside of my house in the back, and one on the interior side of an exterior wall at the front of the house in an uninsulated garage.)
The author marked this model as their own original creation.