Viper antenna on 2017 cascadia

[Headbanger 913]

Hi, I'm brand new to this site, thanks in advance for any advise.
I have installed the Wilson mirror mounts on both sides of my new cascadia
and mounted 2 viper antennas on them. My concern is that they are too heavy
and with road vibration will break the perches off. I've never used this kind of setup
and could use an expert opinion on them.