I used 3 cottage brackets 13″ (also called 11″ x 13″ wood brackets
We had to cut a little off to make it stand flat
Then using 1″ screws we attached the brackets to a 16″ x36″ shelf
I covered the shelf with industrial strength Velcro. The first and last binders I used a 2″ d ring binder and left the back attached to serve as wings (the first one had to be placed upside down. The middle spinders actually belong to a scraprack as I got a really good deal on the expansion unit which included 8 spinsters.