We were trained to do a 35 knot auto for IMC (Huey) with the hope you'd see the ground in time to pull pitch to arrest the descent and figuring running into something at that speed more than likely would be survivable. Used to practice them to touchdown on grass during the daytime, the only problem was maybe a bit of pylon rock on rough grass at low RPM.
Only ever did one auto to touchdown in a twin (76), instructor wouldn't put the throttles up in the flare if he thought things looked good, only once per pilot as a confidence builder, thought it mighty brave of him.