Picture shows void area in upper right and lower left. Those areas can hopefully be filled and the longest branches trained in that direction so they canopy covers everything.
The screen is used as a training tool, if the branches aren't forced to stop and travel horizontally at the level of the screen it serves little purpose. The area is so small and the veg time so short that you might get better results with pipe cleaners and snap and twist training.
In an area that size I would have one plant, the other plant would be in a veg area a couple months behind it. Scrogs can benefit greatly from long veg times. Once a plant gets to the size you have now it starts adding mass fast and geometrically. A month of veg and it grows 4 times more than it did the month before when it only doubled in size.