The way I did it for these last two,is to top them as soon as you can get the clippers between the third and fourth node-around 12 days old-then the next day,shave off node#1,that leaves you nodes 2 & 3 to work with. As soon as you've got enough branch to tie down (day 16,apx.),start the quad training.
About 5 days into the training,you'll start seeing pistils,and flowering will start...ignore the flowers and keep training as if she were a photo...now she's stretching too,so the branches are nice and flexible-but they don't stay that way for long, so you've got to stay on top of it till you decide to let her go vertical- about a week and a half into vertical growth,if any branches want to be "too tall" you'll need to bend these horizontal (supercrop) to keep the canopy as even as possible -if the plant cooperates,you'll get a plant like the Purple Punch-If it doesn't like the training,you'll get a plant that looks like the one I just harvested...not a bad result either way...
Now,this is just the way it worked for me-your results may vary...
I think the key is doing all this stuff early, because the clock is always ticking on these autos
They were only about 4" tall (but real flat) before I let them start growing upward.