The best device to use to help with stolen vehicles has two main characteristics:
- It uses GPS technology, and
- It can be hidden.
The Apple AirTags, or any brand Bluetooth tags, do not meet this first one, and this is critical to being able to track your property should it get stolen again.
The AirTag are NOT designed for being anti-theft devices. They work best to help you locate a missing stationary object, like car keys. If the thief has an Apple or Android phone with them, they will be immediately notified that an AirTag is "following" them. They then could easily locate the tag by forcing it to make a sound. Once the do find it, they can dispose of it. Making basically useless for this purpose.
Since you are deploying multiple devices, it won't hurt to use an AirTag, but it won't really help much either.