Weboost Desktop Antenna Mounting Bracket

I'm an RV'er and I use a cellular booster by Weboost. The inside antenna is the Weboost Desktop (part 301211) which has a rubber base. Nothing sticks to this base, velcro, silicone, nothing! In learning 3D printing and Fusion 360 I wanted to design a bracket that's flexible that it could be simply velcro'd for security, ceiling mounted in the A/V compartment pointed at the cellular devices, etc.

In many iterations I settled on this design that is a top bracket that fits over the antenna and