I am setting up a Bestway 16 x 10 pool (on a level cement surface. I want to use gym floor tiles under it to protect the liner. Do I need to put an additional tarp or something between the tiles and the pool? If so, will non-woven weed fabric be okay? In addition, can the posts be set on top of the tiles or is that an issue? The tiles are just under a 1/2 inch thick.