Mouse Over Stack Viewer and Decks

To help position cards automatically for a module I’ve developed, I’ve created empty decks that a single face-up card will be placed into (9 decks total).

I’ve set up Mouse Over Stack Viewer to show the top card of the deck so that it can be zoomed in.

The problem, now, is that the mouse over stack viewer reveals the top card of a face-down deck.

Is there a way to prevent those cards from being revealed?