What are your pool walls made of? If theyre poured cement, I dont think youll have any problem mortaring pavers down in a soldiers course fashion. If you have a safety cover, make sure teh anchors are very secure, and not relying on the pavers to hold them in, otherwise you may pop the mortar joint. This is what happened did our pool in before we rebuilt it, although we had a rotting wood beam under the pavers. We replaced with all masonry now, and the pavers make for a quite solid coping.