Most of the electric nets have a bottom wire that is not live.That looks like a great idea. The only down side I can think of to this set-up is that since the electric netting doesn't go all the way to the ground, it would be easier for a digging predator to dig under the fence without getting zapped. Otherwise, this looks like a very cool solution!
The trick (so I have been told) is to bait the fence with something like bacon fat or peanut butter on a piece of foil so that the predators get zapped in their nose and don’t come back. It is basically training the predators to avoid the fence.