I'll recommend the same one i usually do and an alternative and explain why.https://www.amazon.com/Street-Guardian- ... 0787HDXJK/
These guys consistently have the highest quality video i can find day and night. If there's any chance you're going to catch a plate it's with their camera. It does have a seperate kit with a open wire to mini usb for direct wiring. The most certain overnight solution is to use an sd card big enough to handle the entire night and pull it out if you see a problem in the morning, just incase impact detection doesn't work or you find it's too sensitive and protects too much which risks filling the card. Because there's so little traffic at night, i've found it's surprisingly fast to skim through an entire night and find an incident if you have the right quick scrolling video player like VLC which loads as you drag through the position bar with the mouse. It might not be the funnest way to do it, but it's a good backup and once a year it wouldn't be too much trouble.
As for dealing with the ui in incidents, that particular camera uses a supercapacitor big enough to correctly end the current recording before shutting down. The advantage is that in the event of an accident that isn't automatically detected, you can just pull the power out of the top of it, and know for a fact the last video will have the incident. There's also a button you can press which i found uncomfortable to fumble with. My older model of this didn't have previous file incident saving either, that is if a new 3 minute section of video just started recording before you press the button, it would only mark the current file as protected. I would hope they changed that but i can't find anything on it. That said, i wouldn't worry about that too much, your card at worse will save a few hours of data, and a 256 can save 24 hours or more. Even if you have to do some digging, it'll at least be there. Although that does bring me to why i use the one i use.https://www.amazon.com/gp/product/B075QBPJ96/https://www.youtube.com/watch?v=be4jjYDobdM
Reduced video quality compared to the first, but in the testing that i did grabbing a plate is difficult beyond a car length even with the other camera. That said this camera has wifi and their own app which has worked very well for me. In the event that i want to pull something, i simply connect to the camera and download it to my phone. At the very least i have a copy, and during an incident it could be more quickly shown to an officer with ease. The video cuts are also more neatly done. Pressing the incident button, or having an impact detection will protect the previous 10 seconds and the following 30 in their own video file, which makes a reasonable sized video for uploading as well. The downside is that i can't find a paired camera for the rear.
In my companies experience with cameras, forward cameras alone are enough to prove whether or not you were doing anything wrong in an incident, so if that's your main focus then you should be fine with that. I'm not 100% sure whether connecting two to the app would work, but the app does seem to allow me to add a second camera by swiping on the main screen.
Also, and huge props for this, the recording light is an extremely dim blue led. It's barely visible during daytime, and totally reasonable during night time. It's a small detail, but it's about time someone stops putting supernova class bright LED's on night time devices. The streetguardian camera has a airplane landing strip red light blinking on it that i blocked with my sun visor, for comparison.
I looked at many cameras before making my decision and what i found is that most of the cameras attempting to use wifi for data transfer are depending on third party generic apps for communication that may or may not work, or had problems like they would stop recording frequently and you have no way to know so be careful if you're looking at other models of those. I haven't experienced any reliability issues with this one.