Could ya'll please give me some advice on mounting the windshield lower posts?

I have seen a few of these now and they are all seemingly different to me!

1) Is there a particular angle the lower posts mount at wrt the floor for instance, or should I be more concerned how well the lower post mounting curve matches the body curve?
2) Or are the posts supposed to match the forward ridge angle along the cowl?
3) How far above the ridge on the cowl is the windshield frame supposed to be? I have the rubber seal for the outside of the frame.

I am using a 2" chopped winshield and 32 Roadster posts from Wescotts.

Many Thanks, Kitz