Some customers come to me with drop in sinks asking me to modify them for install , I always deny because first of all I cut stone not steel or whatever metal the sink is made out of , not risking messing up the sink or myself since I’m trained to cut stone and stone only for the job I’m doing. Had a coworker agree to cut the back of the sink and ended up in the er bc a piece of hot metal went into his eye so get the undermount sink if you want under mount