Can you place the Extreme or Premium mat over an epoxy floor? How do you keep water from pooling under the mat? Is it antibacterial?

You can install our rubber mats over an epoxy floor. They will not harm the epoxy in any way and will actually help protect it. There is no way to keep water from pooling under the mats. Garages typically are slightly sloped to force water out of the garage or are sloped toward a drain. The only thing you can do to reduce any moisture under the mats is to lift the mats periodically to let all of the water evaporate. All of our rubber mats are naturally anti-microbial and mold/mildew resistant. The only time you will see issues is when there is anything organic under the mats or if there is already mold and mildew present.