It doesn't matter. It will not make the car shake or anything else. The weights are so that one part of the wheel is not heavier than the rest without being balanced on the opposite side. Where they are around the circle of the wheel matters. Where they are from inside to outside on the wheel does not matter.
When the wheel spins it has to spin around it's center of gravity. If that's not in the center of the wheel -because the weight of the wheel is not evenly spread around the diameter- then the wheel is trying to spin like, well I guess an orbital sander is a good example.
That's all there is to it.