Welcome to the forum.
How much light do the street have at night ? if it is low a dashcam might not be able to do much for you.
In general the best place to put a dashcam is at the top middle of the windscreen, but this can be hard if mirror is mounted off windscreen, or the car have a array of sensors there.
So you can be forced to mount a little off set due to that.
Most cars have a dotted area at the top of the windscreen, at least around the middle of it, if you can mount a camera on that and just have the lens part peek out below that would be optimal stealth.
Cameras with the wedge design also often come off as just another sensor, if they are mounted up high.
An new alternative is the systems where all the cameras ( 2 ) are remote, these remote cameras are smaller than stand alone cameras and so should be able to be more stealthy.
But so far not that many of those systems, i have the SG9663DR and the mini ( and other brand ) K2S but that one i have not confirmed as good for parking guard, the SG9663DR some with a hardwire kit so no additional purchase of that.
Personally as i park my car in a poorly lit / no light pitch black back yard behind the block, then i have a CCTV camera aimed at it, and in my case as i dont always park in the exact same place + i am zoomed in close to be able to identify i have a PTZ camera ( Pan - Tilt - Zoom ) which is a extra cost.
If you are parking in the same spot every day, you can make do with a smaller and manual zoom camera.
I have my camera mounted on my 2 floor balcony door.
A + with the CCTV system is it have smart motion detect,,, and notification i get on my tablet and phone, so i can easy hone in if there is action within a few feet of my car ( only trigger by human or vehicle shaped objects )
So i can also access the cameras from the internet, but the other cameras like the car one are aimed out of the apartment, have one in the door peephole and one on the back door / fire escape and one in living room window filming street below.
Of course as you park along a street you can not use motion detect as cars and people will be driving / walking by all the time, but with IR aided camera and zoom, you do stand a chance of getting a identifying shot.
But ! of course this do come at a extra price VS just getting a dashcam which i think you should have, suspect people or not.
Many IP type CCTV cameras today you can get with wifi, and they will like a dashcam have a internal storage, so i dont think you need to have the NVR ( Network Video Recorder ) main unit as i have for my 4 cameras.
With just 1 camera and wifi you can access it from TV or a phone / tablet to do settings, and i assume DL footage ( i have never tried this approach in CCTV cameras )
I also have PC access to my cameras, so when i am here on the PC i have the live feeds going in a minimized window i can access with 1 click of the mouse.
If you dont have any front yard, and it is just a sidewalk between the house and parked car, you could probably use one of those smart home camera doorbells.
There is also the option of putting up a trail camera, if you have a way to conceal it in a front yard.
Downside with the dashcams as CCTV cameras is.
Light or lack of it at night ( no problem if you park in a parking garage of course )
Temperatures in the day ( can get too high forcing camera to shut down )
Things on the windscreen, rain droplets - snow - dew - leaves ASO
You can browse this thread for pictures of peoples installs to get a feel for what might work for you.
https://dashcamtalk.com/forum/threads/where-did-you-mount-the-camera-post-your-pictures.502/page-64
