I find that tossing the ball in the same spot every time helps consistency. Instead of learning to place the ball in several different spots, you only have to learn how to put it in one.
I actually have two tosses, because my second serve has slightly different placement than the first. But, every first serve has the same toss, and every second serve has the same toss, regardless of where I'm targetting. It's just much easier for me that way.
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