For safety, Ring recommends only using the Car Cam in vehicles where the OBD-II port is located to the left side of the steering wheel.
One thing to note, though, the Ring Car Cam is not suitable for every car. For instance, your car must be new enough to have an OBD-II port, and the port must be accessible. Some Teslas, for example, are incompatible from both OBD-II port and cable management standpoints.
Ring has a list of cars not compatible with the Car Cam on their website and on the list are many popular models, like the Acura MDX. Honda Insight, Infinity QX60, Buick Regal, Tesla models Y and 3, Honda CRV, Ford Explorer, various Mercedes models, and even the Porsche 911, and much more.
Even if your car supports the Ring Car Cam, if you're already using the OBD port for an insurance dongle or a diagnostic scan tool, you won't be able to use the Car Cam. We reached out to Ring's support center and they confirmed that OBD is the only power option and they don't see Ring adding in other power options in the near future due to limitations of the design, etc. We further asked about the Car Cam's power consumption because if your car battery is not in pristine condition, you might run into over drainage issues (something that the dedicated battery pack could easily prevent). Ring support did reassured that the Car Cam comes with built-in voltage monitoring and it doesn't consume a lot of power.