[Moppie]

As the lotus driving porcine said, you simple anchor the steering arm to a point on the chassis. i.e. the part of the suspension the steering rack normaly attachs to, simply has a linkage run off it, that is mounted to the chassis in such away that it can move up and down with the suspension, but not allow the strut to turn.
If you use an adjustable linkage then you can also have some radicaly adjustable toe angles to go with it.