Motion sensors, how many?

Cupertino, March 29, 2021

I was planning to add motion sensors to my HomeKit automatic apartment. I have three new questions for which I would like to have some answers before making the purchase: 1. How exactly does it work? 2. Do I need one for each room where I want a motion sensor or is one enough? 3. Can I set it so that it recognizes only me and not other people? 4. Do they need some kind of wall installation? Thank you

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