I'm sure there's a "ring" joke in there but I'll leave others to say them.
On the question, I thought it you double them up at the back it gives you more anti-squat, or "drift style" as they say. Put then on the front and you get less anti squat or "drag style". More or less anti-squat depends on the driver or application so there isn't a right answer. I'm not giving my opinon as I've not tried them to comment. I understand the mechanism though.