Originally Posted by
Friwi
Do you own the dwelling or do you rent?
And how permanently do you want it installed ?
The best thing would be to built up a concrete base or concrete box below the floor of the cupboard where you want to have your safe into.
And having the safe into that concrete box with the door flush below the carpet or flooring of the cupboard. You would then have just the carpet hiding the door out of sight. If it is floorboard, maybe make a discret door with hinges out of the floorboard planks. If you ever decide to sell the house it should not be too bad to patch up if you want to keep the safe, or you could sell the safe with the house as it is. The way the criminality goes in our society it could be a little bonus in a few years time.