Photo: Paul Rankin for BobVila.com We may earn revenue from the products available on this page and participate in affiliate programs. Learn More › I’ve tested a lot of smart home gear , and the biggest friction point is usually installation (especially for door locks). The Nuki Smart Lock flips that on its head. Instead of replacing your entire deadbolt, it installs on the inside of your existing lock, essentially replacing the thumb turn. In my case, setup took just a few minutes: mount it, connect it to the app, and you’re done. No complicated wiring, no locksmith-level effort. It’s an instant win for casual DIYers (and renters!).…