My post on immersion circulators was just a comment. I should have said something about an entry being finished over a grill.
I checked to make sure. According to Wikipedia, you can grill on griddle.
"Grilling usually involves a significant amount of direct, radiant heat, and tends to be used for cooking meat quickly. Food to be grilled is cooked on a
grill (an open wire grid such as a
gridiron with a heat source above or below), a grill pan (similar to a
frying pan, but with raised ridges to mimic the wires of an open grill), or
griddle (a flat plate heated from below)"
https://en.wikipedia.org/wiki/Grilling