We recommend anchoring your safe for two main reasons. The first being stability, for this we typically use either 3/8″ or 1/2″ concrete bolts and go down into the foundation. The second reason is that it helps improve burglary resistance. Typically when someone is trying to break into a safe, they first knock it onto its back in order to take a crowbar to the door and use their entire weight to pry it open. When the safe is bolted down, it eliminates the possibility for the safe to be knocked over, thus making it near impossible for a safe to be pried open.