While the Bell is designed to be a drop-in sink, it can be under mounted to your solid counter top. We recommend using under mount clips specific to your counter top material.
The vanity in my house was 25 years old and had a round sink in it (standard dimensions). I had a plumber install it, not sure if he had to cut any but sink fits like a glove, a little glue and all done. Inexpensive job including hook up and new water source valve. Job done by Scotties Plumbing in Oak Harbor. They did an excellent job and the sink and faucet are superb. Good luck.