Do you have a UL document number that specifies the bending/distortion part? I think it might be under UL 1492 but not sure.
I would like to read it but that document cost $500+. I can't find a creditable summary anywhere online.

Because if their is in fact a specification about bending/distortion, I want to know how much. Since this is not a pass/fail like breaking. And I see UL listed mounts that have what I would consider unacceptable bending/distortion under heavy loads. Loads that are however still within their UL listed limits.