My cabinet is 24 inches deep and I have 3 shelves in each cabinet and two are 12 inches high and 1 is 8 and 1/2 high. Should I just get the 11 by 8 1/2 boards? Is there plastic boards for comic books and Can I find them on Amazon. I don't want to get the 7 x 10 and 1/2 if I cannot use for fat Qtrs. What do you think?