We installed a 12V CO Monitor in our main cabin, directly across from the galley (8'' or so from the
stove) despite the warning about keeping them distant from
stoves. (After all...it''s a boat!) Our motivation was the installation of a kero/diesel bulkhead heater (which is mounted 7'' distant from the monitor). It tests fine but has never uttered a peep, despite some *really* big meals being prepared on occasion (the Mate had all 4 burners going...) in a winter climate with everything buttoned up. We''ve also had a few flare-ups during our learning curve with the bulkhead heater; again no sqawks from the monitor. My conclusion is that they are pretty easy to live with until you really are suffering an extended CO contamination situation.
Jack