I read your answer to the question about carpet but wanted to take that a step further. Want to make a section of my bonus room into a home gym area. So I want roughly a 15ft by 15ft section of padded gym floor in the center of the room to use while working out but the entire room is carpeted. Does your roll floor have to be glued/adhesive down or can it just be rolled out on top of the carpet and because of its shear weight it stays put where it is? Your answer to someone else about carpet mentioned "The only issue you may run into on plush carpet is some separation due to the padding under the carpet becoming depressed." What does this mean? We have a frieze type carpet that has longer strands. Thanks