In other words, do the normal alignment, set the toe last, and then if the wheel is not quite centered, "walk" the tie rods equal turns to move the wheel, and re-check the wheel center. You may have to test drive it around the block a couple of times to see where it "really" sits going down the road.
If you have some sort of custom steering wheel and no master spline, you may have to count the turns lock to lock and find center of the box. A box "in good shape," you can feel a change in center with the tires jacked up because the friction in the box "feels" different at and near center This is not always evident