It appears to me that these mounts are too rigid.
I have installed to ram mounts which allows me to articulate the screens anyway I want especially adjusting the screen for the sun.
I believe the heavy rubber balls act a little bit like a shock absorber. I have been using these mounts for my 1197 and 1198 without and problems for 6 months. I remove my units when trailering the boat to and from the lake which is easy to do.
And I would make the same purchase again.
George