here's the general guideline sketch for setting rack location/tie rod lengths. Tie rod should share the same instant center with suspension arms. Not being familiar with your setup, most likely there is ackerman built into the upright, in your case it (front steer) it means the outer tie rod pivot is outside the line defined by the upper and lower upright mounts, ie displaced outside. The inside pivot location should be similarly displaced outside so that the tie rod has a similar arc. I think the best way to build these systems is so that the rack is nearly directly in front of one of either the upper or lower pivot locations on the chassis. Then camber adjustments should be made at the other pivot location so that such adjustments do not affect toe to any appreciable degree.