your landlord will get the notification about carbon monoxide on their phone. Then they will call you. It might be a false alarm twice. Then it might be real the third time but then they decided to not call you and just silence it.
lot's of thing can happen by incompetence, not even have to go too far on the scenarios.
Why would they silence the alarm? It's just a notification on their phone. Silencing doesn't accomplish anything for them.
The first time my landlord silenced a "false alarm", I'd tell them not to ever do that again. The second time, I'd reset the device and register it under an account they don't control.
But yes, I do see your concern now. I was not initially thinking of the landlord actually controlling the device, merely installing and allowing the tenant to control it. There's a lot less ridiculous coincidence required for a landlord to stupidly silence the alarm.
lot's of thing can happen by incompetence, not even have to go too far on the scenarios.