I agree with Chef, but with a small difference.
I'd mark the second side.
Maybe not cross mark, but at least get a sear to seal them.
The reason is this: I'd lay them on the sheet pan top-side down.
The oven can brown the top surface, thereby obliterating your pretty marks.
But yeah, grill marks would look a lot better than what you'll have with a flat top.
I guess you could put a potato masher on an open flame and brand them like cattle for the marks.