I would suggest getting 2 pieces of 2x4 cut to go under the safe, as long as you can get them to go. Run them perpendicular to the floor joices, this will spread the weight over a couple of more joice. Also, it will let you get to the plugs in the bottom of the safe for you to run power in it if you want to. This will also get it off the floor and prevent rust from forming on the safe bottom.
Buy a big one, they tend to get smaller once you get them home.
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