Their template ensures there aren't any issues with stamping. Any design that might cause issues isn't cost/time effective for them, as they'd have to refine the design and make multiple dies to get one that works.
Also, their template is pretty much in line with all the other major manufacturers...
https://www.dynamicdiscs.com/custom-discs_a/267.htm
https://www.innovadiscs.com/disc-golf-discs/custom/custom-hot-stamp-guide/
Then where are all of these stamps coming from? Innova lets your design occupy the center of the disc. And MVP has discs stamped in the middle. Is it just a precaution, or will they enforce the dead zone? i guess that's really a question for them.