I've only ever played on gamestore mats which were neoprene. Are fabric or vinyl mats hard to keep flat or keep still, or any tips on fixing them to a table? I want a mat for myself but I'm mostly concerned with wrinkles and the mat sliding around my large but kinda slippery tabletop. Mousepad material holds to it perfectly but the mats are a bit expensive at the size I want (6'x4').