I would only ever use the official ones. When someone/a business takes control over your property for a fee - whether it be parking, taking your car for a service, car wash etc - it falls under the law of Bailment. As a Bailee, they have a duty of care for the control and safe upkeep of your vehicle/property whilst it's in their control. Any company that has control of your property must also have insurance in place to cover them for any loss or damage of your property whilst in their control. You have the right to seek compensation via the courts should your property become damaged in their control. To safeguard your vehicle, use a dash cam or fit a tracker so you can monitor your vehicles movements. You could use an old phone that's tracked using the Find My iPhone app. Or a Tile: kit.honestjohn.co.uk/reviews/review-tile-slim