there's no need to use every input or output...

it might be a good idea to share the url of your public rack so we can see what you have - it usually helps steer the recommendations a bit...
-- JimHowell1970

there's no need to patch everything, but I would have more potential combinations available...

also, the question is about modules, not about racks

please feel free to mention any modules you know might do the trick, better if it's a small one, let's say 6hp max