Do wireless CarPlay adapters work with any car?

They only work in cars that already have factory wired CarPlay (or Android Auto for the 2-in-1 units). The dongle plugs into the existing USB port and converts the wired connection to wireless; it cannot add CarPlay to a head unit that doesn't support it. Most listings cite compatibility with cars from roughly 2015–2016 onward, but reviewers consistently note that real-world compatibility varies by make and model.