I am pleased to being able to solve every little issue between my phone and my Innovv k2 and I finally mounted it on my Guzzi Nevada for some nice ride.
The photos on how I attached the unit on my motorbike are here: https://photos.app.goo.gl/fsv42gKsBcHEcsHz5
I decided to use adhesive velcro strips to attach the main unit under the seat, and the GPS on the back. This way it will be easy to temporary remove the unit for cleaning or working on the bike.
Front and back cameras I was lucky to find easy way to screw everything without not so much work.
Have fun with my first ride in Rome: