Spark plug wire routing

So I have always been of the opinion that spark plug wires sould be seperated from each other to prevent crossfiring.

For the last few years I have seen a trend on my friends dirt cars to bunch each side together with zip ties and run them from a the dizzy, under the heads then onto the individual plugs.

Do the new style plug wires afford that much shielding that it's feasable to do this? Most of the guys I see are running Scott 8mm wires...really popular with many engine shops and racers....

Spark plug wire routing
Author: Krooser