Torso would probably be good, any deeper and you get too much shadow in depressions or behind bumps, dosage matters. But you lose head aiming into curves, so m

Torso would probably be good, any deeper and you get too much shadow in depressions or behind bumps, dosage matters. But you lose head aiming into curves, so maybe somewhere in the jaw region might be interesting. You'd need an entirely new approach to fixing for sports that don't already have full face headgear, but the usual forehead position isn't exactly fashionable either (historically this position comes from mining I think, where the shadow/structure effect isn't wasted when it works on the ceiling instead of on the floor).