Want to install smoke and co2 detectors in the hose.Mom lives with e and is home alone while im at work 10-12 hrs a day,she often falls asleep and doesnt hear lots of things. So i want to get wireless aka battery interconnected detectors that will cover basement and 1st floor . Just a reg ranch house not very big. Which brand is the best ? Oil furnace in the basement as well as garage under house as well. Thanks.