all the aircraft I've had the prop stop in have been injected, inverted systems types.
FWIW, the Robin 2160 doesn't have an inverted flight/oil system, and is not fuel injected. At the very least that would make it easier for the engine to be starved of fuel than if it had an full inverted flight system and injection.
Wouldn't mind trying the full power spin from a vertical climb though, but probably not in this aircraft...