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I second the plywood, what I would do is place the plywood where you want it to be, then place the safe on it and mark the holes then drill them through the plywood (you may want to stain and urathane it for a custom finished look. Place it back on the carpet and mark the holes then cut an X at each spot, this will stop the drill bit from tearing apart the carpet, then drill the holes into the foundation and insert the anchors. Depending on the lag screw length typically it will be no more than 3 inches and any water pipes should be below that. If your in the Flower Mound area I have a hammer drill you can borrow.