Where i must put hooks in overridable functions?

Neither. Hooked functions don’t need to be pluggable because child themes can already unhook and replace them with remove_action().

The main functions that you’d want to make pluggable are functions that are used in templates i.e. template tags, and those functions aren’t usually hooked, so the placement of add_action() isn’t relevant. Even then you probably only need to make them pluggable if they’re used in multiple templates, because otherwise the child theme could just replace the template file.