The American Red Cross has been offering free installation of smoke alarms across the country for nearly four years. ARC chapters often team with local fire departments or ask for volunteers (scouts) to install detectors and provide a safety talk. Perhaps there is a service project opportunity for your scouts with your local Red Cross chapter
http://www.poconorecord.com/news/20180224/scouts-team-with-red-cross-to-promote-fire-safety
http://www.redcross.org/local/new-hampshire-vermont/home-fire-safety/smoke-alarm
http://www.tauntongazette.com/news/20180204/free-smoke-alarms-and-c