That's under perfect circumstances, though. That's assuming you can get behind two enemy mechs, that they let you get behind them, that their allies don't do anything to stop you and that you don't splash any damage at all. If even one thing goes wrong you die without doing any meaningful damage and waste your time/tonnage chasing after that one-shot kill. It's one thing to have fun with it in quickplay and entirely another to try to bring this into FP.
Ah well. The idea would have been solid... but PGI retardation means that rocket 20s spread more than a skittle team. That and it has a minimum range of 50 m. Waste of a hard point. I'd do better with a air strike. ^ | and that's saying something.
Someone should send and email and ask them if they can replace the visual effect of rockets with bubbles.
The 15s apparently have a much lower spread, so you could do that with a MPL and a, uh, targeting computer 1?