Hey Polycount, nice community you've got here :) I hope I've posted this in the right place... I've started taking my first steps into the world of Quixel and PBR texturing and I'm loving the suite so far. I'm making an interior sci-fi environment with a modular based approach to the wall assets. Having now finished…
Exporting your model in the format you've mentioned is a good idea to test for modularity. I would do three objects (combined as a single mesh before exporting) using the center object as your tile check. :)