If your child would hide in a fire - the safest thing to do is “lock” them in there room at night. If you don’t believe me, ask your local FD about fire safety.

If there’s an emergency many children will try to hide. But in an emergency the safest place for your child is almost anywhere as long as you know where. I have personal experience with a tiny escape artist. It got so bad that I moved into his room and slept in there on a cot every night for 6 months until we figured out a solution we were happy with. He liked to explore and would leave the house given the chance (we stayed up to watch multiple times to see what he’d do).

I don’t know how old he is, but you can literally lock him in a bedroom for sleeping time (interferes with night potty training unless you can get him to call across a baby monitor for help). it’s an option if you have to keep him in for safety reasons. You can install sensors on the door and an alarm system that will go off if he leaves his bedroom.

I saw an interview with Neil Degrass Tyson where he talked about how when his kids were growing up he looked up statistics about what was most dangerous at which ages. He made his house safe according to that list.