Drapery Holdbacks Placement For Curtain/drapery Holdbacks?

Placement for curtain/drapery holdbacks? - drapery holdbacks

I want my curtain, which are of medium thickness install. Is there a certain height / level to drill to the window frame to the ground and the prints? Moreover, there are bound to be some distance away from the window frame, or not at all, except the call from my eye?