Having just looked at the orfab for the first time, here's my thoughts.
Based on the pics I have seen, there are no holes in the roll bar directly above where the door meets the frame.
Assuming you are okay with measuring and drilling holes through the bar on both sides, I agree that the door surrounds should meet flush with the door and support the trektop NX.
Watch this video at about the second minute to see why you need these holes to attach the door surrounds.
Hope this helps!