My son and I finished a layout which is a rectangle design with two turnouts running diagonal,  top and bottom; hence the polarity issue, if I knew how to attach a picture this may assist my fellow hobbyists.

I purchased a pair of 9"gapp terminal tracks and the Autoreverse module by Bachmann. The instructions are not the greatest nor is the illustrations.

Do I need two modules?, do I insert the gap track after or before the turnout?

Thank you for the assist.

Paul