I recently got a safe after realizing that the contents insurance has a lot of ifs and buts making it very tough to make a claim. It can be mounted on the floor with a provided bolt or wooden bolt. I live in a double storey built 15 years ago. What is the best way to mount this to the carpet floor in the first level? What would typically be below carpet? How can I find a stud and avoid electric wires? Should I pre drill? What are the measures I can take to mount this strong and secure?