Scrolls that come with hooks usually come with two, so what I do is use one hook in the center for each scroll. Due to their size, they normally stay aligned pretty well, so long as you don't hit them.
I love anime wallscrolls. They're awesome! I have Sailor Moon, Toshiro Hitsugaya (from Bleach), Sakura and Syaoran (Tsubasa), and all 13 captain's from Bleach wallscroll. I don't really like posters as much but they're cool.