Nest Protect Units
The density of CO is slightly less than air, AND common sources of domestic CO also generate warm air. For both of these reasons, CO accumulates at high points and fills living spaces from the top down.
I have two battery-operated Nest Protect units, both on interior walls five feet above the floor.
I also have eight wired smoke alarms on various ceilings, so if you are doing a new install, I would probably place the Nests on the ceilings.
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