Generally, with unequal length wishbone suspension, the rule of thumb is to have the bottom wishbone parallel with the ground. If you aim for that, all the other angles will follow, and the ride height will be set by the wheel/tyre combination.
One can then adjust the ride height of the car, if necessary, with the spring platforms, usual reasons for doing this would be to cope with speed bumps, rough roads, engine or transmission parts grounding etc. and for corner weight adjustment.
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