Automated license-plate readers are a completely different topic

And yes, I oppose those also, in large part because they are 1) a general dragnet against every traveler, 2) have zero specificity to any particular individual, and 3) have no judicial check or due process on their use.

Adding an individual device to an individual's car after repeated breaking of laws (and perhaps more importantly, repeated failures to keep it discreet enough to not be repeatedly caught) has zero of those properties. It is for a specific individual, for a specific time, after due judicial process. As long as it stays confined to those parameters, it seems more acceptable than many alternatives.