Three walls printed much nicer than two for me. It just did a nicer job, in less time, on the slats between the cooling vents and the prongs of the clips, with minimal extra filament.

It's possible to fit four of these on a 200 mm print bed, but it takes some arranging. When I tried this, I also had trouble with the print curling up on the edges. You may be able to solve that be reducing the cooling, but it might be better to settle for printing two at a time.

Estimated print time in Cura with my settings for one piece was 2:15. The actual time was closer to 2:45. Estimated print time for 4 was 9:06. I didn't get a good measure of the actual (I let it run overnight).

Let it cool a bit before removing from the build plate. It can warp if it's still too warm.

Warning

PLA has a glass transition temperature as low as 140F, and the UniFi APs can get quite warm. In a consistently air-conditioned facility, you'll probably be fine. I've been running one for two weeks like this as of the publication date. But if you're in a location without A/C, such as a shop or older building, where it's possible the base temperature could be a little warmer, you may want to use ABS or PET-G instead.