My buddy has five. Two in the stern NEAR the aft quarter, but not directly on the corner, two more mid cockpit, and one in the bow. Granted, it is a center console with great bow access, but we use the bow a lot when chasing down BFT.
As for a gin pole, good idea if you are expecting anything over 200 lbs on a regular basis.
The other comment about fighting while anchored is also spot on. You need to throw off your anchor IMMEDIATELY if you get a good sized tuna or it can and will spool you. A simple anchor ball setup is a necessity. What we notice on wicked tuna is that the relative lack of maneuverability with a single fixed screw leads to a lot of lost fish at the boat. Much easier to circle with an outboard setup. Keeps the line away from the boat!
If you do watch wicked tuna, they use a motor driven hoist for both the anchor and bringing the big boys on board. Unless fishing a lot, that is a bit much. But a hand crank version would be helpful.