nighttime recording

So I have front and rear dashcams (a 2-channel set), but as my primary need is for parking mode, I now want to be sure I capture events on the sides of my car as well. I don't want another set of the 2-channel dashcams I already have bc it discriminates between front and read cams (for example...

Does anyone have experience using the K1S on a flat rear window with privacy glass? I have the original privacy glass bath that most new SUVs get at the factory. How did the K1S perform in your vehicle? I would also be interested to hear how you found nighttime video recording from such type...