I have that same tray but I find it's just too big for Valeria's set up. Each card compartment has so much room left over for the five-ish cards per stack in VCK that it just takes up a lot of space.
Hmmm, I hadn't considered that. Looks like the cards are tipped up though so it's not too big a deal. I also notice the cards extend higher than the top. Does that mean that if you are sitting behind the tray that you can see the bottom of all of the decks?