Divide room in - simple if there is an aisle down the middle.
One facilitator on each team defines ships/groups of people. 4/3/2 person sized ships. The facilitators also keep score.
Over a report out (or multiple report outs since people almost always sit in the same seat) every time a participant speaks, they are triggering cannon/firing shot at the other side of the room. The shot lands at the mirror image of the person (or none/or nearest at the facilitators discretion) at your mirror image on the other side of the room. Only one facilitator knows where the ships are, but they can communicate with the team for who needs to ask the next question or respond to the next report out team.