Ganged hooks are an excellent way of presenting whole fish or long strip baits, with good hook coverage throughout. The number of hooks in a gang and how they are rigged though, really depends on the target species.
For instance, a small two-hook gang might be perfect for presenting a whole whitebait in an estuary, but if spinning the beach or coastal washes from the shore or boat, three to five might be necessary to give good hook spread for a whole garfish.
If toothy critters such as tailor or mackerel are the target, it’s often a case of the more hooks the merrier.