The Domani 765 sink faucet requires 1 hole for installation. It can be installed in a hole made in an inset, undermount, or wall-mounted sink. Additionally, it is tall, making it suitable for freestanding sinks, such as countertop sinks, as it can also be installed on a countertop. Depending on the construction, it can be installed behind the sink or on the side. However, you should check that the water flow ends in the center of the sink to ensure full functionality.