When your presenter is on stage, they want to speak to the audience, but if their only view of their slides is behind them that can be difficult. Speaking with your head turned back over your shoulder takes your attention away from the audience, turns the mouth away from the microphone, and is a recipe for a sore neck.
Confidence monitors are the answer to this problem. Placed on the floor in front of the stage, confidence monitors (Downstage Monitors, or DSMs as they’re professionally known) allow your presenters to see their slides while naturally and comfortably facing their audience.