No screws needed, instead I used small sized Command Brand hanging strip ( look at photos above.) Leave the shelf set for a few hours before adding the weight of the deck of cards.
Video tutorial explaining the strips can be found below.
Each shelf took around an hour to print at 0.2 layer height, 15% infill (i think...) and 50.0 mm/s speed.
Maybe have a test and just make one shelf and see how snug your deck fits.
If you have any questions, please feel free to ask.
Ill probably design something fancier in the future but for now I just wanted some practice with fusion 360.
They dont look so slanted in real life :D
I have not tried other brands.