No issues overnight. The houses we've been in must have extra think walls/interference, as I've seen many say the likes of 1 U6-Pro will cover a large house. Upstairs where the AP is, you'll be getting into the hundreds of Mbps. Downstairs seems to be between 100-200Mbps and just like my old place, it drops like a stone in the garden (30-50Mbps). This was a quick test though and I haven't fiddled with power levels or channels but think it's on auto channel optimisation by default.
I've put the WD Purple in the UDM SE, got a bunch of record, camera and motion settings to sort out at the weekend. The 6U rack and UDM SE are under the stairs (did a deep clean for dust last night) and temps seem fine, will keep an eye with dust and sort out ventilation. And my wife and mother-in-law are set up with Unifi Protect on their phones, just need to get a tablet for the kitchen we can attach to the walls so my mother-in-law can easily glance who is at the door instead of get her phone which is never on her person
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Future upgrades will be the 10GB aggregation switch and I might chunk in a NAS or backup into the network. I know Unifi can have their ups and downs but been very impressed with how it all connects and easy setup process (bar whatever shenanigans happened last night).
Next up - getting around CGNAT for my Emby server.