Make sure your car doesn't leak any water before installing any type of mat under your carpet. That stuff will trap moisture and rust your floor boards out.
Noted. Found a leak when I washed it at the passenger Window. The seal was cracked and worn. Repaired the seal for now. Sprayed it with a hose to see if it would leak again. Nothing so far but I am scouring the car. I thought the trunk leaked, but turned out it was standing water left over from a broken water bottle I had in there.