I have a 450lb safe that I recently had moved into my bedroom on the second story of my house. This particular safe does not have the option of wall mount like my other safe, this one must be anchored to the floor. The location I would like to keep it does not have much room to move the safe around so that holes in the safe would line up with the floor joists. What is the best way to anchor this thing to the floor? I was thinking of something similar to a drywall anchor, except more heavy duty and designed for OSB/Plywood anchoring.