Do you really HAVE to place the weight on your heels? I heard this is proper way to do it, especially if you're trying to do a hip/glute dominant squat. But the thing is, I experimented with weight on heels (raised my toes to help me do this) and weight on whole foot/toes both were equally quad dominant for me. Does it matter?
Should be solidly centered on the mid-foot. Weight on heels is more of a coaching cue used when you have trouble coming onto your toes or you're trying to keep the shin as vertical as possible.
