I keep them on my 14" Max Modular ALUMAX rack with Traction Board Brackets.
I'm a HUGE fan of the company, (and also the owner, lol)
His cover looks like a Retrax, which has a metal frame. That's the biggest reason for the gap.
Thanks for posting the video, we had not seen that one yet.
Just and FYI: Spray a little WD-40 on a rag and it will clean anti-seize off the...
We specialize in bed racks that work with tonneau cover.
Look here: Shop — MAX Modular Truck Bed Racks
And here: TONNEAU COVER FITMENT GUIDE — MAX Modular Truck Bed Racks
Let us know what truck you have, and we can offer further assistance.