Maximum angle between the drag link and the center link?

Attachment 58065Hoping someone with steering experience can help me out.
I'm designing a drag link and center link for my project.
This is a rear steer set up (steer box behind the front spindles).
My plan is to have a center link that swings on two idler arms like an Astro Van that is pushed by a drag link.
Currently the steer box is 5.4 inches rearward of the center link with an angle between a drag link and the center link of about 13.5 degrees. (See attached)
Is there a maximum angle that is acceptable between a drag link and center link.
Thanks