From the latest test, CT, it appears that 3 heads are needed up front to jam LA and other 238pp guns. 2 heads seem to efficiently jam all other guns (if properly installed and leveled).
The problem is that the control box can only accept 4 heads.
So...how many heads are you getting or would you get?
Four and put 2 up front 2 in the back. 4 and put 3 up front and 1 in the back. 5 using 2 control boxes, with 3 up front and 2 in the back, or 6 with 3 front and 3 back.