Is there a fast way to identify unenclosed rooms so I can better prep my model?

The best way to pressure test your model as it pertains to unenclosed rooms is to select only one item (ideally an item that's used infrequently in your model) and attempt to sync quantities. Once completed, the report lists all unenclosed rooms in your model for the selected floors as applicable, even if the selected item is not in those rooms. From there, you can review the rooms, properly enclose the boundaries, and sync more/all items.