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The rear can be steered just as well as the front. Except the rears are anchored, if you change the angle of the LCA you change the relationship of toe. The front you correct with steering, the rear has a set ratio of deflection. You ‘may’ compensate enough with the eccentric bolts and resetting the toe angle with adjustment. But beyond a certain point you run out of adjustment, the chassis side is a fixed point so now you have to go to the other end to make adjustments. If you want to make sure the rear has minimal change in steering then you need to do what ever needs to be done to minimize the ratio of change the rear gives. People have gotten away without bump steer correction, but without knowing the spring rates they are using and shock valving, it’s impossible to say if you need it or not.
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