Hi, Carmen- Sorry it took so long to get back to you, busy day around here...
That is a possibility, looks like you've got about as much space under that light as I have in my box- what I used to do when I grew 2 plants in the box was to train them in a rectangular shape, instead of a square-
That way, they'll fit side by side under the light, and more of the plant will be in the "good light".
My plants would end up roughly 12" wide by 22" long, so it was a little tight, but they'd both fit in the box.
And, since your plants have those drain pans under them, you won't really need a noodle- you can just tie the branches down, and hook the tiedown to the edge of the pans, either with clips of some kind, or, the easy way, just bend the wire under the pot edge...of course, this will only work if you leave the pots in the drain pans all the time, as opposed to taking them out of the pans to dump the runoff out. -Turkey basters, or a dollar-store super soaker can be used to pull the water out of the pans, leaving the plant in place....
Another thing to consider might be putting some spacers (boxes, bricks,books, etc) under the photo plants to get them a bit closer to the light- It may just look that way in the pics, but they
look like they could be about 8" closer to the light....
Autos are looking good!