if you are familiar with and can use the "backward fire" tactic in a gunboat, mounting all basic gunboat turrets would be your best bet. I've seen people down a cap 8 tridente, or fight off several smaller ships in their bottlenose like that.
but, if you prefer sniping, mounting 3 razors 1 pulse 2 basic turrets (or 2 razor 1 pulse 1 missile and 2 basic turrets on the back) would be a good idea too.