Are Tile trackers worth buying?

I want to get some Tile trackers for my family. Are they any good and which version would you recommend? Are any of the alternatives to Tile any good?

How do you ensure your car isn't being used when you leave it parked at an airport?

Do you have any advice regarding airport car parks? I recently read about yet another scam where an independent contractor offered off-site parking in a muddy field and cars were returned either damaged...