The best option depends on your budget and how many properties you manage. For a budget solution, the Supra C500 Pro (50-80 pounds) is a wall-mounted key safe with a Police Preferred Specification rating. For a smarter option without WiFi dependency, the igloohome Keybox 3 (100-140 pounds) generates auto-expiring codes via an app and works offline. For full smart lock capability, the Yale Assure Lock 2 (180-250 pounds) has native Airbnb integration and generates unique codes per booking. For multi-property operators, a centralised platform such as RemoteLock or Klevio integrated with your property management system is the most scalable approach.