You can honestly credit them however you want, Per Song, something like "Music / Sound Provided by-" And then any variation of my social tags, like @TheTurtleBox, theturtlebox.itch.io, or turtlebox.bandcamp, whatever works for you honestly.
So honestly, yeah whatever is easier for you. I feel like crediting each song is a lot more work than just my handles or something.
As for the whole album thing, yeah on Bandcamp I have it set up so it's signifigently cheaper to just buy everything I have uploaded on Bandcamp at any given time than to just buy individual things over time.