On the beach. :smt043
Seriously, I don't know anyone that's found, used and been happy with a grill on any "day boat". We've used the swim platform to set a grill on (with soaked towels under it) and that worked for brief and simple grilling, but not worth the hassle.
The nice fancy ones with mounts, usually sound better and look better in the ads than they do on your boat. Friends have one but gave up on it mounting where it could be used.