I have a full size gun safe, so I don't have any knowledge about the size you are looking for. With that said, you might want to check Canon safes (mine is a Canon). They have 2 office/home type safes, tho they may be a bit larger than what you are looking for. The thing about Canon, they have a lifetime warranty and you don't pay for shipping if it has to go back to the factory, they do.
Here is the link.
As far as securing them, I would suggest you contact someone at whatever safe company you will deal with, as to whether it can be secured to the floor. Full size safes generally have pre drilled holes inside that allow you to bolt them to a foundation. I don't know if the smaller ones do or if a plate comes with them for that purpose. In any case, ascertain first if your home has a post tension concrete slab. If you do, there are cables that crisscross the slab, usually in the middle of it. If you hit one while drilling, you could be injured or killed; it has occurred. That's why I didn't drill mine in. Good luck.