AutoFloorGuardContainment Mat (Black) for Snow, Mud, & Rain (7ft 9in x 16 ft)

It appears the edge height is the same for all three sizes. Was this a recent change? I recall that deluxe size had a higher edge than the other sizes

i want to get this for mobile detail but with my business, i only use about 7 gallons of water to wash a car. Can this possibly contain that amount?

what is the thickness of the material?

The compact mat (the only one that fits my garage) is 3 inches shorter than the length of my car. Will the mat do the job for collecting melting snow?