Mirrors are too sophisticated and risky, usually. It’s mini cams in smoke detectors in the bedroom, or in vents.
I think Airbnb’s are the highest risk these days. Reason is, because there’s nobody around but the owner. Setup is non risk and when you leave that’s it, door is locked. At a hotel there are other employees there watching, so it’s far riskier in terms of raising suspicion. There’s also no way of knowing who you are filming, it could be a politician, a cop, or a German.
You have pervs who perv on it, then post it online when they are through with it for residual income, so it’s a paying hobby basically.
If you’re staying in Airbnb’s in a place like Pattaya you got to check it. That’s high risk.
What you do is turn off the lights and get it as dark as possible, turn on your phone flashlight and sweep the area looking for reflections in vents or anything else. If there’s a cam there you should see a tiny reflection there like a firefly.