Selfhosted

Without getting into too many revealing details, my wife and I have a handful of Ring cameras that we are looking to replace, especially with the bullshit they've been trying to pull lately. They are used often, indoor and outdoor.

Last year, I tried rolling my own replacement with a standalone Frigate machine and the HA integration, but that ended up falling flat on it's face. I am not looking to troubleshoot that setup - that ship has sailed. Moving on.

Enter Unifi Protect. I'm already familiar with Unifi, my network has been running fantastically on the OG ~~trash can~~ UDM since it came out, plus a U7 Lite AP for extra coverage in our tall-ish 3-story duplex. The place is wired with Cat5, but since we rent, some areas will have to be handled with wifi-only units - the G4 instant looks suitable for this.

Questions:

1. Ring has a very "wife-friendly" interface. How does the Unifi Protect UI fare in comparison?
2. I'm looking at the NVR Instant to handle about 6x FHD cameras. Would a 1TB WD Purple be suitable for that?
3. Motion detection - How is Unifi Protect with this compared to Ring? Better, worse, or equivalent? How flexible is it?
4. (less important) I'm reasonably certain I can set up a doorbell replacement via HA, zigbee button, and a G4 Instant. No Cat5 to the front door unfortunately, just the usual pair of wires to the wall-mounted ringer inside. POE is not an option here. Viable? Or should I do something else?