Currently, there's already a function in orthographic view where, if the viewport extends beyond the world center, annotations automatically snap to the edges. What you're asking for is to have them always snap to the edges, meaning they would never display at the world center at all?
Fantastically useful addon. Lovely to use as well. One less reason to use Maya now.
In a future version it would be nice to have the option to display the units on the viewport edges in orthographic view rather than along the world axis.
thank you