Modified the original Pro mount and combined it with the original mounting plate. Many thanks to @Jsmaz3 and @DominikPalo for the original models.

I have added a model for the U6+ and one for the AC Pro and U6 Pro Unifi Access Points.

Best result with 40% infill and precision print profile (PrusaSlicer for AnkerMake M5)

You need the ceiling mount from the original design:
Ubiquiti UniFi AP ceiling mount by Dominik Paľo | Download free STL model | Printables.com