It is impossible to completely conceal the head unit, as it has to be able to pick up the signals (radar and laser). But I wanted it to be a little more out of the way than to the driver's side of the rear-view mirror, where I had it originally.
Now I mounted it high up and very close to the passenger side of the rear-view mirror. Having it there requires the second display unit, as the main unit is now out of my line of sight when I'm driving.
The position of the second display at the bottom of the gauge pod is perfect.