Their AirTag Magnetic Mount is arguably just as "dangerous". It can be mounted to the underside of a car in one second and no one inside the car will hear it.
You'd probably get the notification pretty quickly though, assuming the installer didn't use whatever "silencing" tech this post is apologizing for. My wife usually leaves her purse in the car, and I get the "[Person's] AirTag is moving with you!" notification whenever I leave the house without her. I keep forgetting to trust it or whatever.
Yes. Magnets and duct tape are particularly dangerous combination, too, and even cheaper.