Hardware question: small hinges

Hey,

I am making a small top to a business card holder. It is going to sit on it at an acute angle (maybe 30 degrees or so).

I am not really making the top. It is the outer wood the came off from the live edge of a board. I am not sure it will work, considering what the screw will do to that “bark”, and whether hinges can sit on a rounded edge of wood.

But I guess my first question is just a basic hardware question:

What hinge do I need if I want the top sit at an accute angle?

Here is a diagram with a key:

1 a knot in the wood :)
2 the mortise where the business card will be set back so as to not contact the flip back top
3 the live edge of the card holder which is a little cross cut of wood
4 the bark like slice of live edge that seperated from the main asteroid
5 pink things are possible hinge areas

Thanks for your help fellas!

-- I came, I was conquered, I was born again. ἵνα ὦσιν ἓν