Drop-in baths have a finished rim and are designed to drop into a deck or custom surround. One of the advantages of drop-in baths is that they can be installed in corners, peninsulas, islands and recesses, or can be sunk into the floor. A drop-in bath is supported from below and has a self-rimming edge that is designed to sit over a frame topped with tile or another water-resistant material. Choose from Soaking, Whirlpool or Airpool functions. If you are unsure of which manufacturer to choose, check out freestanding bathtubs from Kohler, American Standard, Toto, and Kaldewei.