Remember that in Europe, the installation of a CO detector ( even a “sticky on one” ) is considered a modification. To remain legal, you / maintenance organisation have to follow the guidelines laid down for its installation
We've got 2 in the a/c, stuffed into map pockets, along with the PLB. I don't count that as 'installation' You can hear the alarm going off with a headset on. It's still better than those stick-on plastic things - does
that count as installation?
TOO