We have a couple of older gen HP DL360P G8’s sitting in a DC in Auckland, I’m not near a computer to grab the exact specs but it’s all running on proxmox and heaps of headroom :)
Yeah Ubiquiti get some shit online by so-called professionals, but I have a UDM-SE with a U6-Pro AP and it's great. Been contemplating getting a U6-Enterprise just for the Wifi 6E.
I personally don't like the Mesh systems, I'd rather have all AP's wired in, but I get sometimes you can't just run cables