Best smoke, fire amd Carbon Monoxide detector for ST?

There’s only one on the official “works with SmartThings” list, a zwave device from First Alert. It’s a very basic device, in particular, it doesn’t trigger the other smoke detectors that you have and it doesn’t announce which room the alert is in. ( that’s what “doesn’t work with onelink“ means.) If I recall correctly, you also cannot turn off the smoke detector from the app. You Have to physically press the button on it

https://www.smartthings.com/products/first-alert-smoke-detector-and-carbon-monoxide-alarm

Some community members use the nest protects which have many more advanced features and there is a community created integration for those.

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