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One for every room I intent for humans to survive in, plus one in each car. Also recently upgraded to hardwired CO/smoke detectors and each bedroom also has a combination alarm that uses Z-Wave to alert me anywhere, just as a backup. Also, we practice fire and earthquake drills monthly, along with a couple of other scenarios that are more rare/less dangerous.
Where do you live that all of these things are such a risk?
Take a look at the fault lines around California. There’s lots of seismic activity, and we’re close to train tracks so we have gas mask drills too (added after what happened in East Palestine). Given the major large-scale risks in our area are fire, earthquakes, and a train derailment spilling chemicals, those drills seem prudent.