You can just throw e3 plugs in and accomplish the same thing. I can't remember which Engine Masters episode it was but, IIRC they gained 5 HP+ over conventional plugs.
I don't remember that, and I can't find the episode. I'm not a fan of any funky plug that makes silly promises. Back in the day, my RX-7's NGK spark plugs had four-prong grounds. They didn't make a "hotter spark", and the spark didn't jump between different electrodes. What the four ground straps maybe did was allow the plugs to last longer. Whichever strap was a hair closer to the electrode got the spark jump, and as the electrode wore away on that side, it would start sparking from a different strap. With an MSD 6A, my RX-7s plug electrodes would get worn down to nubs and still fire. The old "split fire" plugs were the same way. The spark only ever jumped from one side, and if that side of the electrode wore down, it would start sparking from the other side. When E3 plugs first came out, they had a groove in the underside of the ground strap, and they advertised that same garbage that their plug would "make multiple sparks".
I also don't think indexing plugs really makes much difference. It doesn't "throw the spark" anywhere. The spark will always follow the path of least resistance between the electrode and ground. There is some evidence that with a low compression, straight plug motor, indexing helps, but I think your horsepower gain would be within the margin of error on a dyno. In PlayingWithTBI's picture, the top of the ground strap will always be between the electrode and the intake valve, and as the air/fuel mixture has been compressed, it's all right there when the ignition strikes. Is the ground strap going to make a measureable difference in how the flame wave propogates through the chamber?