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What I would do…
Position the safe (and any pad or moisture barrier) and drill from the inside of the safe down into concrete. Over drill the safe floor if needed to clear the anchors. Bolt it down- no need to move or reposition. If you can bolt floor and wall its even better.
Use “gun socks” to prevent dings and scratches and alternate long guns muzzle up-muzzle down. I can get 43 guns in a 30 gun safe.
If the safe is on a wood floor with subspace basement or crawlspace, support it with steel underneath. I know of a guy that lost a nice collection inspite of his expensive fireproof safe, not theft or to the fire, but because the fire burned enough that the safe landed in a basement flooded by the firefighting efforts.
Use a golden rod or similar dehumidifier.
