How many main-battery turrets could a ship carry?

What is a plausible maximum number of main-battery turrets?

Probably ten: three centerline turrets forward, three aft, and four wing turrets, although that would not be a good design.

Ten turrets is offered as a possible upper limit. The proposed arrangement has six on the centerline, three forward and three aft, plus four wing turrets. The layout is judged a poor idea even if it can fit.