You seem to be running before walking. How do you come to such a specific design parameter so quickly?
Once you solve the (big) fuel issue since the devices are likely to be smallish you could have more than one, no? You could use podded propulsors as Steamer was alluding to somewhere above. You could have propulsion cells separate from ships service cells and locate those close to where needed - operations/control center, bow thruster?
This stuff seems a ways off for ship size propulsion. I mean you can’t read that report and think scaling this up and making it commercially viable is going to be easy or is just around the corner. It’s a collection of technologies / approaches at this point and still in early stages. Experimental and prototype units. I’m glad to hear somebody has money for R&D but commercial off-the-the shelf soon? Don’t think so.