Many years ago, I ever found a hidden camera inside the room of a 3 Star Hotel in Malaysia where I checked in with my FB. It was hidden at the corner end of the ceiling board (slightly torn like a hole). On closer examination, I found the hidden camera and you can imagine my anger. I ripped off the cam and went down to confront the front desk. Of course, they deny anything to do with that. I got my refund and checked out immediately.
Sometimes, it's better to be more careful and look around the room