Pretty much what I was thinking; the answer is different on a model-by-model basis, but I also would like to add another factor: the level of scale realism you're after.
I once did a mildly lowered '90s Impala SS 'shelf model' for a client that would be mounted to a display case base permanently, so I hatched a plan.....I shaved and ground down the front frame rails where the complete suspension member attached, and I did a similar thing at the mounting points of the rear suspension. I was able to lower the whole car and keep the structural integrity of the suspension components, so the wheels didn't 'squat' when I zip-tied the finished car to the base.