Floor safes offer great security if installed in the floor surrounded by concrete but provide very little fire protection. Floor safes offer great protection for valuables due to the body of the safe being encased in concrete on all five sides. The reason they lack a fire rating is due to the door being exposed with no fire board to dissipate the heat. This leads to the contents being destroyed in a short period of time.
If you need to protect money or important documents, you are much better off purchasing a free standing Composite fire safe, burglar fire safe or high security burglar fire safe that has 1-2 hour fire rating and is anchored with multiple bolts into a concrete floor. This is a much better option than a floor safe.