Aruba has some 'instant on' units which might be a decent replacement but I don't have nearly enough experience with them to say for sure.
At home I'm happy with Google WiFi mesh all around my house.
Wasn’t sure where to look next… note taken on Aruba
After they bungled reporting the hacks last year, I promised to never purchase anything from Ubiquiti again. Good to know Aruba may be an option.
TP-Link Omada is a very similar system like UniFi in this price range. Their Controller GUI almost looks the same as UniFi‘s.