I run the lower line right above the ball with the gear about 40 feet back from the cable. The second release is 10-15 feet up the cable with that gear only 15-20 feet away from the cable. I put a scotty cable stopper right above the second clip so my rigger will stop automatically.

My reasoning for this setup is that when if the lower clip catches a fish, the gear is back far enough so that it most likely wont foul with the gear above it which is closer to the cable as the fish rises. It also helps to turn towards the side the fish was caught on so that as he rises to the surface, you are moving your other setup still on the 'rigger to the side.

Also remember to drop your gear slowly when stacking, don't do a freefall like you might with one setup.