In the past I've played around with different methods. 1. Release sequence; draw, middle finger to the corner of the mouth, relax fingers at release, outside of the thumb move back along the side of my face to touch my ear. 2. Release sequence; Draw, middle finger to the corner of the mouth, firmly hold the outside of the thumb to side of my face, relax fingers-release, the hand is held solidly to the side of the face through the shot/follow-up.
Both work and both are really a two point anchor, using the middle finger and the thumb but I've settled on method 2. With method 1 there is more of a tendency to pluck after shooting a lot and I get tired.