Coming in late here, but these days it’s a little more common for a glass break sensor to act as an audio detector, many don’t have to be mounted on the windows that are being monitored, just nearby.
There are some older types that were more like contact sensors, but the audio is popular.
Here you can see video of the linear–it’s on a wall across the room from the window that breaks.
And here’s the installation guide for the Iris zwave glass break detector–the instructions are for ceiling or wall mounting, not glass contact.
The zwave ones will self identify as a sensor alarm.
OK, I’ve been looking into this device class a little more and smartthings does support both flood sensors and smoke detectors which use the same device class: sensor alarm. So I’m thinking that one of those device types might be able to be modified for the Z wave certified glass break detectors but I don’t know if anyone is actually working on one.
@april can you check? Make sure whoever you ask knows we’re talking about an acoustic sensor alarm, not a contact sensor or a door/window alarm.