Can the outdoor sports tile be installed on dirt or does it have to be installed on concrete? If so, will it still have good bounce for a pickleball or basketball? Thanks!

Our Outdoor Sports Tiles need to be installed over a solid surface. Acceptable subfloors would be concrete and asphalt. Installing these tiles over dirt will not provide the needed bounce for a pickleball or basketball. In addition, when it rains, the playing surface will become unstable.