With my first Tesla, an S P85, I never installed the front license plate, because it looked pretty bad on the black nosecone. I relied on an EZ tag mounted on the inside of the windshield - which worked, but sometimes struggled to be detected. Our local toll road system periodically falls back on license plate detection when we drive past the toll tag sensors. And for our neighborhood gate (that is triggered by the EZ tag), we have to be directly under the sensor to get the tag detected.
With our S 100D (without the black nose cone), decided to go with a front license plate - and the EZ tag bar. And that has worked much better. The tag is reliably detected by the toll road sensors - and for our neighborhood gate, our car is detected much earlier, so we don't have to stop and wait for the gate to open.
I'd strongly recommend using an EZ tag bar - and now that I've lived with having the front license plate on our S 100D for a year, it's really not that big of a deal - and certainly worth not looking over my shoulder every time I pass a police car to see if they're bored enough to pull me over and write me up for not having a front license plate...