As far as geometry related to rear steer is concerned, this is an ideal system for asphalt cars. The amount of rear steer due to body roll is regulated by the height of the front mounts of the arms, which are always mounted lower than the rear point of rotation which is the axle. Rear steer amounts due to the Panhard bar angle are regulated by the angle.
The Metric Four-Link SystemThe metric four-link is widely used for the stock classes where the host car's design utilizes that system. It uses four links, as the name implies, that aren't parallel to the centerline of the car. The top links are angled from a top view with the front pivots wider than the rear pivots. The lower links are angled from a top view with the front pivots narrower than the rear pivots.
Conclusion On asphalt, we don't want to make large changes to components that influence rear steer. Make small adjustments if you feel you need to, and when you find the correct amount of rear steer, stay there and tune the handling with the other components. Drivers can feel small changes in the height of the front mount on a right-side trailing arm.