This instagram post shows cyclist Robert Förstemann doing deep behind-the-neck presses (touching but not resting on the traps) with a wide grip, about the grip I would use for a back squat (but narrower than a snatch grip). The elbow joint is making a 90 degree angle at the point the upper arms are parallel to the floor.
I really like doing these deep, slow, controlled behind-the-neck presses touching but not resting on the traps. I used to have some shoulder pain doing heavy overhead pressing but after a couple months of behind the neck pressing like this (starting with low weight of course), I've never again had any shoulder pain doing heavy overhead presses of any type. But I've never seen anybody on YouTube or Instagram except Förstemann doing this kind of behind-the-neck press.