Some time ago there was a lengthy discussion on tubeless/hookless caused by a video of a Continental tire blow-off at 5 bar air pressure. The rim in question was measured by Continental and found to have rim sides that were too short and a bead diameter that was too small. I recently received my third set of BTLOS hookless wheels with no spoke access holes that require no rim tape. All are working great. My Zipp 303s wheels now have a new home. They worked great too, just wasn't fond of rim tape.
Here's a link to the new video, explaining the out of tolerance rims.
https://www.youtube.com/watch?v=H1xvlifJI2E