Also doing Zoom sessions here (since March) and my therapist has been in several different places in that time. Sometimes she's at her home (blank wall with painting behind her), sometimes her office, sometimes a room I don't recognize, and once she had a really cheesy fake zoom background of mountains. I honestly don't care where she is, but the fake zoom background made me curious about why she didn't want me to see that space. It was also super distracting because it was a terrible background...basically her head floating in front of a giant snow-covered mountain range. It was hard to look at.

PS- I hate zoom and I'm so sick of telehealth.

PSS- I think you should ask your T to give you a "heads-up" about his location since it's causing you to lose a couple minutes of your session time to adjust. It's like you said, if you were going to be meeting him in a different space at his regular office then he would definitely give you some warning about that.