Unifi UAP AC-Pro/U6/U7 Horizontal Mount
I know there are other beefy designs, but I wanted one a little lighter (less material) but still able to hold up the weight of the latest models. Holds up well, no sag.
I designed it so that even at 100% infill it only takes 53g of PETG, which is what I printed it in.
I also designed it to make use of the included hardware. I did buy better drywall anchors as the included ones are bit weak IMO.
Note the mount holes are in a 50mm spacing, which lines up with the "C: 3.5" round junction box" holes on the https://store.ui.com/us/en/products/unifi-professional-mounting-system included with the AC-Pro, U6, U7, and enterprise models.
NOTE: Just now realized the picture is of a previous version. Only difference is a different hole pattern for more efficient use of material, but structurally the same.