Floating Bowls are mounted on custom no bowl vanity decks to become an integral part of the cast vanity. Bowls can be positioned for any custom installation.There are over 50 different floating bowl molds available. There are oval bowls, square bowls, rectangles, octagonal, shell shaped, scallop shaped, and other designs. You’re not going to start with all of them, but it’s a good idea to start with 10 different styles and sizes and end up. To make a double bowl vanity top, you will have to have two matching floating bowls to pour that vanity top.