I considered all your position choices. You don't want to place them where they will hamper your playing or be accidentally adjusted while playing. The most practical is slightly ahead of the jack in the traditional style. All your other choices place them in the way of operation.
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Do you have room on the sides? like this?
http://www.cigarboxnation.com/photo/yeah-mon-3?context=user
I considered all your position choices. You don't want to place them where they will hamper your playing or be accidentally adjusted while playing. The most practical is slightly ahead of the jack in the traditional style. All your other choices place them in the way of operation.