Comes with a floor mount kit. I suppose if you had to you could wall mount it with the door opening from the top.

Slightly less than one square foot. The walls of the safe are not that thick but are steel so they are strong.

This safe is not a fire proof item.

Yes, although, I did not know how I was going to botl the safe into my closet. Did not have a chance to try.

Technicaly it is front opening, but I think you can almost use it either way. Mmm, good question.

You will need both. Once you enter the passcode on the keypad, you have about 5 seconds to turn the key before the lights reset. I put the key in and get ready, then enter the code so I can turn the key right away. The key will not turn without the passcode. After the lights go out you can lock it, but you will need to re-enter the code if you want to open it again. You pick the code, and it can be anywhere from 1 to 8 digits long. Setting or changing the code is simple. You can always by-pass the code with the master-key (for dead batteries, or forgotten code). They supply 2 regular keys, and one master key.

Too small for a laptop unless it is a real old one with small screen.

Dimensions given are exterior dimensions. Subtract 5/16 inch from each dimension for interior size.

This safes falls under the category of "Anti-Theft" therefore, has concealed hinges so that the door of the safe cannot be easily removed. It also bolts down so it can't be lifted and carried away. Most anti-theft safes do not have a fire rating. If you need a fire safe look at safes under the category of "Fire safe" not "Anti-Theft" safes.

About 40 lbs.