Nobody can give you a yes or no answer here. All applications and scenarios are different. If you really want to know, use a silver market (or black if your strings are colored) to mark the proper location for the peep. Shoot 100 arrows. If the peep is still there and hasn't slid, draw your conclusion.^^^^^^^
Dental floss is a TEMPORARY measure,Would you say to avoid the dental floss if you're truly serving above & below the peep?