Currently in a small place that I have been improving. Looking at installing smoke alarms now. It's a first floor maisonette and I originally intended to put a heat sensor in the kitchen and a smoke alarm on the landing. But... I have since discovered ionisation alarms and optical alarms. So... I am not looking at a heat detector in the kitchen, ionisation in the living room and optical in the hall between the bathroom, kitchen and 1 of the bedrooms.
Or.... I could just buy a nest protect.