You have the dive door i guess, the one on the side of the boat?
It depends on how you fish for Tuna, trolling or chunking, how much rods and if you use tracker spreader bars.
I troll alone with 5 rods
2 each side in rod holders going to the outriggers mounted on the hardtop
1 on transom for center lure
I could have one more on t-top mounted rod holder working far behind, called Shotgun
If needed a teaser could be run from each outrigger as well, either with a teaser reel or from a short rod in most outside t-top rod holders.
I don't see a need for 3 rods each side in gunnel mounted rod holders.
Chris