There is always JB weld.
https://forum.esk8.news/t/made-of-jb-weld-serious-main-structure-of-item-made-from-epoxy
It’s not the prettiest solution and once you do it, forget about adjustability. However, after you dial in your setup, if the motor torque is causing your mounts to move on the hanger, you can lock them in place with a liberal application of two-part JB weld.