Flo Arena is compatible for dual tournaments. It's just not the most user friendly. For that matter, neither is track as dual tournaments don't translate great online.
What is incompatible is finding someone that knows how to operate Arena (or track for that matter) for all 58 mats. NHSCA requires each team to bring their own scorer - they are usually parents with little experience.
In past years they had taken the paper box scores to the head table and then someone entered them on Gimp. Well, at least some of them. Don't know why this didn't happen at all this year.
NHSCA National duals is a difficult event to handle for online. If I were to attempt to put results online, I probably would get enough capable scorers to handle the last day from R16 on (8). Before that, I would assign them to the top 8 seeded teams. Honestly, Day 1 and Day 2 are not really even worth following.