I love my Annie.
For 223 I center the base of the neck, for my 6xc I put the middle of the shoulder in the middle, for 3006 I put the base of the shoulder.
I test going progressively deeper until the neck and shoulder tempilaq both turn clear at the same time. If you center it on the neck the neck will turn way faster than the shoulder so you need to center the shoulder more to even it up. It’s a bit of a sliding scale but the neck will always turn first as there is much less material there.