Dashcams are often smaller then they appear in sales material, there are even a few models we call remote systems in this case dual remote, that have 2 small camera units on a wire from a central unit you can hide where you like in the car.
One such system could be the street guardian SG9663DR.
The actual layout of your car also might have a say what shape of camera are the best, the wedge shaped cameras when installed in the middle top of the windscreen they often come off as just another sensor camera.
You should browse the picture heavy " hoe did you install your camera " thread, to see what people have done with different dashcam models, and real estate challenges on their windscreen.
I am fortunate to have a cheap little car, so my mirror are mounted off the roof, and in front of it are a taller shade area at the top of the windscreen, meaning i can mount on the shade area and only have the lens part of the system peek out below the dotted area, this make the install very stealthy,,,,,,, though not in my case as i often have 3-4-5 cameras there.
dashcamtalk.com
My last upload there are way back on page 54
Regarding install, if you want to use the in dash / console 12 V port are pretty easy, in that case often the only thing you might have to take off are the trim plastic on the A pillars.
There are plenty of tutorials on how to install dashcams on youtube, the camera model might not be the same, or the car, but these things are often much the same.
I have done it many many times in my car, so i can install a dashcam blindfolded in 30 minutes.
Regarding rear camera and routing its power & data wire, i will recommend you first drape the wire along the intended route and so how that is in regard to interference on DAB / SAT radio you might use, this is a general problem with rear cameras.
Doing a "dry" run, and finding out you have some issue, you might have better luck routing the wire along the other side.
If you have a smaller car the wire for the rear camera might also be long enough ´so you can route it along the bottom of the car, i often do that in my very small very cheap Suzuki car
My car dident even come with a radio, but it was a WIN CE radio 2 X DIN i put in it in 2012, i want to upgrade to a android unit, but are on a pension and other things keep popping up.
I have a few times seen people use the likes of Waze cameras ASO, but CCTV cameras are generally " tuned" for a different kind of job, but they will of course record stuff, and for sure any camera are better than no camera, and any camera will record what you do with your car, so lane holding - color of intersections ASO, all things where a idiot might make a fraudulent claim against you, that you can then disprove with your camera.
Americans seem to often want to be able to share footage on the spot, that is not needed in little old Denmark, i just submit my footage to the insurance, it is their job to duke it out with the other part, if they need a witness in a court case they can just call me, but it is extremely rare traffic incidents go to court here,,,,,, i have never heard of anyone do that.
PS: I am currently testing the Viofo A119 mini, it is just 2.5 X 1.5 inches, but it is just a front camera, and if you are in a single plate state, and that plate are in the rear, i really think you should get a 2 channel system, CUZ then with oncoming cars your rear camera at least have a shot at capturing the plate on the back of the other car as he pass by.
Granted in the 10 years i have run dashcams, pretty much all i have taken from them of video footage have been from the front camera, but i would still recommend a 2 channel system to most if they are not tied down by fiances.
EU plate warning ( our plates are larger and much more easy to read VS American plates )
