My boat is a Shawnee commissary boat with ribs running the length of the boat in the floor. I cut 3/4" plywood to make a false floor, painted it with non-skid porch paint from Lowe's, then screwed it to the ribs. HUGE improvement as anyone who's been in that boat with me will testify. But for that to work (have a place for a little water to go) the ribs seem central. For a flat bottom boat with integral floor like Supreme, some kind of semi-open mat seems optimal.