What guarantees are there and how does one locate a fire-alarm installer that offers a perfect installation that is impervious to toast burning or strong ovens?

What guarantees are there and how does one locate a fire-alarm installer that offers a perfect installation that is impervious to toast burning or strong ovens? Any evidence that safety is degraded between the ability to wave off an alarm versus the oft-used removal of batteries? As the saying goes, the lesser of two evils -- we're only human.