Have any of you put a floor mounted type gun safe inside of a wall opening? I have a space to do so and want to cover the safe door with a sliding mirror. Why would I want to do this, wall mounted safes are typically not very deep because people do not have the depth, I do. So I want to stick a floor mounted safe in the space. Concerned that there could be issues with it inside of a wall that has no air flow from the rest of the house.