On a system if one goes out they all beep
Mine are stacked on my dresser for that right now
7
And they are hard wired too
But the backup batteries have to be good and some of mine are really high in stairlwell
All my boys can roof it or jump the window
Guest bedroom is 3 stories up above drive but has dormer too
I wouldn’t do it with young kids in the house
My youngest aged 9 now sleeps on sofa mostly in den on Apple TV with 150 pound Rottweiler by him
I’d say he’s good to go
>> On a system if one goes out they all beep
Relatively new code requirements you’re speaking to — which is good. But the annoying “false alarm” factor is still too high.
A few years ago, I helped a friend with a detector unit the continuously faulted. Why? The instructional label within the unit describing battery placement had the +/- signs inverted. So the battery never made proper contact. But as an integral component to a house-powered system, the (backup) 9V battery problem wasn’t alerted as a major failure, but instead as an annoying, infrequent chirp.