I�m looking for some mats to put under my kickboxing bags/weight room in my garage. I have puzzle mats down right now. I�ve had to use carpet tape underneath them, which was a mistake. It�s really difficult to replace damaged ones. Three questions. Do these mats stay together, or must they be taped? Do they come in custom larger sizes? Can I put them over the puzzle mats, or should I just scrape those off? Thanks! Please don�t sell my email.