When it comes to safes I have a few opinions:
1) A safe at all times should be concealed. If it's not it's a useless hunk of metal! - If you're at home during a robery or home invasion you do NOT want them to see your safe... so hide it like your life depends on it.. because a gun will be pointed to your head if they do find it!
2) A safe should keep contents protected from possible water and fire/heat sources. - Important items need to maintain their integrity.
3) A safe should be difficult to remove from the residence. - EVERY safe can be opened if someone has enough time... don't give someone the luxury of taking the safe to another location and taking the time they need to get into the safe. Make sure it is secured.
My latest idea for a project is turning an old beer fridge into a safe. I don't drink as much as I need/used to... so I have no need for a beer fridge anymore. But many people have secondary fridges either in their home basement, mud room, garage or what ever. I'm thinking I might gut out the fridge, and install a very good quality safe inside that can be bolted down to the ground from the bottom as well as "structure" in the back.... either that or I'm turning the thing into a big dehydrator and I will make a boat load of deer, elk and moose jerky.