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Typically it isn't good to start out parallel. It is even worse to orient angled as shown.
A good starting point would be lower arm parallel to ground, upper arm is shorter and slopes down from the upper ball joint toward the center of the car. Somtimes it can be better to have the lower arm slope upward a bit (though slight).
You want to set up your roll centers based on the vehicle cg height. Then watch the motion of the roll centers through articulation to be sure they don't move too far away and create unwanted roll. There are also a lot of other concerns, such as jacking, rear RC height v. front RC height and how that relates to oversteer/understeer, etc.
Get the suspension design book by Milliken and Milliken and that would be a good place to start understanding the importance of instance centers and how they interact with creating roll centers.
Good luck! I am working on my rear suspension design as we speak (though staying with front struts to minimize the costs at this point - they have worse evils with RC migration). Of course, I rely heavily on my chassis guy since he has the experience - I am just trying to be an "educated consumer" and it does help to know!
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