So, I finally got my subtrunk cover which makes it a real compartment to compartmentalize. Have not been able to find any organizer, but I was able to use the dividers from my previous organizer, which just have Velcro ends to them, and I was able to easily subdivide the subtrunk into several compartments on my own.
I’m not sure if you can buy dividers of various sizes with Velcro ends or not, but if you can this definitely makes it easy and infinitely customizable. Sometimes the easy solutions are the best solutions.