The sockets are inside the dash / console. There is plenty of space behind the console and the modules are very compact.
The dashcam mounts flush against the windscreen with a sticky tape pad and the lens can be adjusted up or down to suit the slope of the windscreen. There is enough clearance in front of the mirror so that it is barely visible inside or outside the vehicle, yet has a perfect view of the road as it is right in the centre. Most of the dashcams I've seen use a sat nav style mount which takes up far too much space, especially if you plan on mounting a phone or sat nav.
I'm using a custom fit mount for my phone and it works well for Google Maps and Spotify. I did try using a dash cam app, but it seemed to strain the device and was a nuisance to remember to use. With the dash cam, it's all automatic.