From what I could find, the "maximum count size" is a stitch count of 53 wide x 55 high on 32-count Sage Jobelan fabric "over 2" which would be 3 1/4 inches wide x 3 1/2 inches high. If you add 2 inches extra fabric to EACH side you would need fabric that is 7 inches wide x 7 inches high. I am making the assumption that these calculations are for EACH ornament. I'm a believer of checking twice and cutting once, so you probably should call ECS "customer service dept." at 1-800-800-8517 to verify these calculations. Also Kristi from ECS will probably see your "chat" question on the board and be able to help you as well.
I am not an employee of Everything CrossStitch but one of the stitchers that saw your question on the ECS "chat" board.