We have battery operated smoke and CO2 alarms in gîte and rental property, which meets legal obligation. However also have a fire extinguisher and smoke blanket in the kitchens.
When we had the gîte classified we discussed with the inspector why the current 112 point system includes things like a ‘phone (totally irrelevant these days!) but makes no mention at all of safety features. Apparently this will change soon’ish.