Welcome to DCT
@Dr disinfectant
Yours isn't an uncommon request, as can be found in numerous threads here. First is you need to realize the shortcomings of dashcams for this purpose:
* Dashcams need light to capture images. Some do this well, some don't but all need some light or you'll see nothing
* Dashcams cannot cover every part of your vehicle though they can sometimes cover most of it. This can get complex and expensive sometimes, but fairly good coverage can be achieved at a reasonable price if you can compromise some coverage for cost.
* For purposes like this, external security cams do this job immensely better and if possible are a far better choice. Dashcams should be seen as something to use like this when you can't have anything better
* Dashcams are only a tool to gather evidence; they cannot prevent damage. Your insurance is your real protection, and dashcam footage may at best save you the deductible on a claim while helping your insurer recover their costs. They can also assist investigations into incidents.
* The best protection requires other actions first which may be inconvenient such as parking only where there is good lighting, parking away from other cars and traffic, parking only where there are other cams or persons to assist you with security coverage etc.
It is certainly possible to get good coverage with dashcams but it will involve some expense, and based on what you want for image quality and recording times can get expensive fast. A basic 4-cam setup with cards and hardwire kits will start in the $250 range, and offer you maybe 2 hours recording time. You'll need about twice that price to get this kind of coverage for 8+ hours of a work shift. Better image quality will add as much again.
Perhaps you may not need this much; a 2-cam system can catch a lot and may be enough to prove the culprit for intentional damages. How much proof you need will matter here too. Your company may act on evidence of them being shown to approach your car intentionally without need or cause along with the damage they cause, or they may require absolute irrefutable video of everything.
So a long reply by me but necessary. If you think dashcams are what you need we can get you there
The first question we will need answered is what your maximum budget is- from that we can go forward
Phil