Many years ago I had firearms stolen by a condo manager and maint. man, working in concert they hit every tenant in the complex. I vowed to never let that repeat. Years later I met a fellow named Bob who my bank contracted to do their key, lock and safe work. I said Bob I'm considering buying a gun safe what would you recommend? Without hesitation Bob replied a bean bag chair. You may require more than one. He said this w/a straight face. Really, I'm in the market for a safe. I sell'em, but not one of them is bulletproof against two adult males, statistically two men will remove the safe using tools they brought or borrowed from you and open it at a remote location. I'm sure there have been exceptions, monitored alarms work fairly well. Depends on what you want to spend. This is what suggest ...bolt an inexpensive model to the slab in plain sight, put a few bricks in it. This does several things primarily it's loud and time consuming. These guys come prepared, they're gonna take your safe. Bean bags full of foam w/a big zipper but do what you think best. I'll sell you a safe.