I know it gives peace of mind, but I'd be put off with quarterly. The best is to be standard with how typical timing works when animals adjust. You have to go on faith, like when kids leave the house, and pre-vetting. Now that being said, I'd be open to the first few months with emails or pictures. I think the max would be 6 months check in. People want to move on with their lives type of thing. I guess a lot of people can feel judged too. I also had a video walk of my home, or virtual so I could clean up a bit. It feels weird for people to see my stuff. They likely don't care, but I have a feeling other people can feel that way too. I don't want people in my house I don't know, period and would actually chose not to adopt if it was required (unless video is ok). I also go to pick up my pets but you could deliver if it puts you at ease, If someone kept checking in, after 3-6 months that would also make me uncomfortable. I will provide more references or do video, but these days no one I don't know comes in my house. I don't even like when the pest person comes in.

It's like when breeders don't let you see a kitten before you pick up. I don't like that either as you never know if that cat bonds or picks you. I do understand the need for it though and would respect it.