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I've done it both ways: did it myself for a small safe and let someone else do it for the big gun safe. It's pretty simple. Use the plywood trick as noted above. Drilling into concrete with a hammer drill was a lot easier than I'd thought it would be. Took longer to line up the holes in the safe bottom than it did to actually make the holes!

One thing: go back and give your bolts a little snug up turn every 60 days or so. As the carpet and underlay compress it'll loosen the connection a bit. After a couple of those tightening sessions you're good forever.