TRACKBAR, anyone here run one?

lets see if i can word this where you are able to understand what i'm trying to say.

The point where where the panhard bar mounds to the axle, how do i determin how much above/below the axle to this mount needs to be. are we trying to accomplish a trackbar that is parallel to the ground? or is there a degree that is considered to be a sweet spot? if adjusting the mounting point up or down affects the roll center of the car, can the bar being too low make the car push in the corners?