Since I have nothing under my floor and really no reason to pull up the floor once it is installed I decided to put a piece of 0.025 6061 around the floor to attach the bottom of the Kydex. This should also keep dirt and stuff from getting into the belly and make cleanup easier...I hate net plates but they seem to be the best solution with a #8 machine screw and a finish washer to hold the bottom of the Kydex.