We just had 2 colorbond sheds put up. One sitting on concrete ground and the other on pavers. Both are on a mild slope. They are not water sealed. Just wondering, before storing things, shall I put down some sort of mat just to keep things off the ground away from water, moisture and dust? I’m thinking the mat itself needs to be waterproof, affordable, anti slippery and easy to clean, probably a solid piece rather than with holes. Any suggestions? Thanks in advance.