Nice setup. I have a Blackvue from about 3 yrs ago that I have setup in the front window (I don't have the two camera version) and I can't see it at all when I am driving. I didn't do the wiring to make it run while parked, never really worry about my car much when parked.
I listed to a podcast recently that talks about some of the legal issues associated with dash cams. The link is below and is something I would recommend listening to for those looking to use a dash cam. The two big topics he discusses is don't erase video if you are in accident, especially if you are at fault. And be careful of recording conversations, either people in the car or via the speakerphone, as that can be against the law if people aren't made aware they are being recorded.
http://oppositelock.kinja.com/the-legalities-of-dash-cams-the-podcast-1732600118