don't go without stopper beads - thats the big one - when lots of stuff is going off on you all at once, the last thing you will remember is to turn the rigger off manually and you will lose more than enough release clips as it binds in the rigger coming up. Deeper rod off the side of the boat, let out more from flasher to clip, higher rod off the back and shorter length. As mentioned, let it drop slowly to start once both rods are clipped up - hold onto the barrel with 1 finger if you are running 12lb+ or it can fly too quick and pop off your clip - once both your reels are spinning fine, let er rip where you want.
Stacking seems pretty necessary for socks, and if you get one on, leave the rest down as long as you can...if you are fishing springs, well, I don't have much experience with springs and stacked line, but you would have to work like a dog to get the other 3 lines up if you have a hog, otherwise just asking for trouble leaving them down.
That's been working for me with no major problems (lost a couple of socks with line cross, but no biggee) - others may do something different for all I know. Keep in mind also that you may not be able to tell which rod is going off as the other rod on the cable will also bounce, so a few seconds extra to be sure can be helpful.