Of course the issue with Airtags, is that if the thief has an Iphone it will notify him that he is being tracked. It will also beep the airtag so he can find it so he is not tracked. I was looking at this this summer when my family and i went on a vacation and took our mountain bikes with us. The coolest and most creative solution i found for that was this:
https://us.muc-off.com/products/tubeless-tag-holder
A valve stem that held the airtag inside the tire. Which would make it very difficult to hear and almost impossible to find.
If you plan to use an airtag you would need to be creative like that, or the thief will just throw the airtag out quickly.