I mount mine to where they pretty much hit between temple and ear. I don't worry too much about the angle of them, but just that they are close in to one's head and pointing at about a 45* angle. Most of my venues are so wide or taped from so far back (even 2nd row orchestra is about 40-50' from the singers) that it's hard to really get much 'imaging.' I resign myself to getting the very best possible SOUND. And these babies do deliver THAT.
I don't run mine thru a croakie, actually. I use the dpa clips to put them on the glasses, then use a very small black zip tie and attach it to the ear portion of the glasses for safety's sake. I'd really like to devise a croakie that was zipable to easily get the dpa's in and out. How do you guys easily get them INSIDE?