Several thoughts.....
? My Liberty safe is full... not of guns, but of my wife's chocolates, which she buys and then insist that I lock up where she can't have but one a day ! Anyway instead of a BIG safe, I thought to buy a nearly identical size next time. My thinking is... if thieves break in they probably figure they can enter one safe in the 30 minutes they have. Then they might spend 45 minutes deciding which safe to break into.
? Your major concern for loss of personal property is NOT theft, but
fire. Placing the safe in the basement will double the fire rating since a concrete floor poses no fire issue. Place the safe in a corner of the basement and you might triple the fire protection.
? The most common fire protection used in gun safes is simply sheet rock. If you can build your safe into a closet with 2 or 3 layers of sheet rock you can increase the fire protection that way too.
? My safe sits on a scrap piece of cheap carpet. The carpet is slick and allowed me to make minor adjustments to the safe's location very easily. When finally located, the anchors went through the carpet and into the floor. Then I trimmed the excess off by going around the periphery. The carpet, being cheap synthetic, does not attract humidity or hold water.
I used a dozen 5/16" dowel rods to roll my safe to its location. So the carpet was about the same thickness and made transfer easy. It also kept from scuffing the painted bottom on the concrete. Rust, once started, is very hard to stop. There are numerous other cheap water barriers, like roofing felt.
? There are pre-made adjustable steel poles you can place in your basement to shore up the floor in that area.
Before you install the safe, place a level on the floor and take some readings... or lay some marbles on the floor and see if they start to roll. Then do the same afterward.
See "Jack Posts" HereHope this helps.