Waivers exist and are very easy to enforce in this situation. Either you'd have to sign one with your lease or hoa agreement. If not then then the room would have some sort of access control and in order to go in you'd have to sign a waiver. It's the same as a gym, pool, rooftop area where you can also easily hurt or kill yourself if your dumb.

Insurance companies don't care about access controlled areas with dangerous objects, otherwise shooting ranges wouldn't exist. They care about random people coming into your lobby, tripping and then suing the place because they didn't sign a waiver.