I'm going to preface this by saying I've never seen the top of a ZooMed, but are you sure you didn't get that backwards?
The one exo I have definitely has 2 obstructions for hinges. No idea about zoomeds but I do know they have 1 door.
Originally Posted by Jjl
The ZooMeds have an obstruction (plastic housing for the hinges on their doors). Exo Terras don't have this issue.