What some folks do is mount two of those sensors. I never could figure out if the alarms were real or just a battery glitch...
Alot of things will set them off. generator running outside and the wind changes made mine go off one time which was a steady alarm... All the other alarms I seem to get are short beeps???
I always thought a beep ever second or so was a battery alarm and not worry about that and the real alarm would be a louder steady sound...
But like everyone else when it goes OFF I get nervous... I will get up and open some doors and windows haha...
Having two working at same time close to each other might give you some better confidence feelings about them... i.e. both should go OFF if you had a leak????
Roy Ken