Gridfinity - Minimalist adaptive wallet holder (ridge like)

I wanted a place to leave my wallet on my table. As I already have an EDC section on my table (see photos) and had just 2 free squares I threw together a quick design for the Gridfinity adapting holder for minimalist wallets, depending on the amount of cards in the wallet. 

In my case, I added a spring that I had lying around but it should work just fine with the printed one. 

Would love to see your makes/remixes.