The installation in your car is interesting. Why not clean up the installation by using mobile scanners? I would find the installation you have made very distracting and therefore unsafe. I strive to keep all my radios in the same place where I can look forward. Otherwise you have to look sideways and go from one view to the other to see what is going on. The price of the new scanners is a small investment considering what an accident would cost.
I'm considering moving the 996XT and one of the 15s into the car. For now, though, the handhelds work fine. And because I'm using location-based scanning, I never have to look down at them because the groups and systems turn on and off as I drive along. Perfectly safe.
R