Rear Axle

• Measure from wheel contact area up to lower edge of diagonal brace (at control arm fastening point).
  Fig 1: Measuring Vehicle Height (Rear)

  Courtesy of PORSCHE CARS NORTH AMERICA, INC.

When adjusting the camber or toe, there is mutual influence (if the camber value is changed, the toe value also changes).

You should therefore adjust the camber and toe (gradually) at the same time.