I recently asked the same question, There is no "set" way to mount them.
But in the kit from finishline mine had an instruction sheet, I used this as a general layout, But moved 1 or 2 to please the eye.
1 thing that was pointed out to me is the round red sticker with E is to advise battery location, I mounted mine where the Finishline picture showed.
But it should be near your battery.
And here is a thread where question was asked.
Meatballs / Rondels / Decals
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.