Well I was just going to put it in window but I have seen people mount it with a square plate on the side and it does look good!
The red strip is removable, but the honeycomb part isn't.
You can take off the whole honeycomb grille and number plate area though if that helps.
Also, don't put your numberplate in the windscreen, it's illegal, and when you do get pulled you will more than likely start a thread complaining about being pulled.