It would be best if you got your alignment checked/adjusted. It may be within specs and not need it but then again you never know. The struts in that car will determine where the caster is on it. In fact that is how you adjust caster on that car, you install longer or shorter strut rods. However, because caster is typically a pulling angle and not a wearing angle it is not overly critical. If your car drives down the road and does not pull and the steering wheel returns to center as it should you are probably pretty close to where you need to be and if you are out and need adjustment you will be looking at buying a strut rod or two to make it right.

Mark