Not sure about what reliability issues you have been reading about. I have 4 Ubiquiti APs connected to a USG that have been stable for several months. I actually just restarted them 2 weeks ago after February as I wanted to get on to the latest firmware.
I use an erx with an es24 and a uap for the lab. That has had issues but all of them human error where I messed up something while trying out something in CLI.