I only use toothpicks to mark them, and I don't flip.
I might have 6 on, I'll put none in the regulars, Sage might get one on the ends, Maple two toothpicks on the end, Cajun one toothpick in the middle, etc.
I have plans for the Maple the next morning, and Cajun into the Red Beans and Rice, so I want to make sure I'm slicing into the right one for dinner that night (or snacks during the cook!)