Don’t many modern ships already have this? I recall watching “Big Ships” or some such on
Discovery Channel about 15-20 years ago where they explained ships already having multiple stern and aft, starboard and port, “pods” either with jet streams or rotors.
Sure, but having driven ships with those, they're not as maneuverable as they could be. It takes time to deploy the pods and often they aren't available at high speed.
