Originally posted by MinnFlyer
You have it right, here's a pic for a visual.
Also, go with the two tanks side-by-side. Without a pump, you'll have problems with having one of them on the CG.
I've never had any trouble having the rear tank far aft..the engine only "sees" the tank it is drawing from...the other tank just feeds into it. Also works if you want to run a small tank near the engine with a large tank feeding it..the head pressure changes in the small tank are small, making for very consistant runs.