Sorry for the delayed response Broncojeepscout. I wanted to go check to make sure, and I'm surprised nobody else chimed in during the meantime.
I'm pretty certain that they should be under the leaf spring. It's really the only way they can go, unless you get much longer ones. If not, they bind up more quickly when stretching the suspension out a bit.
It would be cool to route them over, for more clearance and to keep them away from getting hung up on things, but the brakes just don't usually let them do that due to the angle of the dangle and the angle of the entryway into the backing plate.
And besides, after awhile the cable would just wear through by rubbing on the spring every time it moves even the slightest amount.
An original metal clad cable with the big metal spring wrapped around it might have sawed it's way through the leaf instead! But the modern jacketed type would wear through quickly.
Paul