I would strongly suggest placing some 2x4's under it so that the bottom won't rust up.
I've seen several of them put on concrete or standard floor and the humidity causes the bottom to rust up.
Try to put it inside. I have one in the corner of the living room. Not ideal but it beat the garage.
I'm in GA also and I think it will be a tough fight to keep the humidity down in it in the garage. A golden rod and several bags of desicant changed often might do it.
I have an AMSEC and am happy with it. It almost seems you have to buy whatever the local dealers sell since the shipping gets too high if you odder your own.
Buy a quality safe and you can't go wrong.
He who dares wins.
NRA Life Memeber