I have 2 cards in all of my 15 machines.
To add them to the project, both of them are in the Live Input in the asset tab in that machine.
For your application, you only need 1 card. I use 2 inputs for 2 different sources.
If you want 1 inputs on 2 outputs all you need to do is apply that 1 capture card to 2 different layers - just like a picture or video.
As a note also, you don't need a video layer for a capture card - you can put it on a graphics layer.
Does make sense?
J