I have had a catastrophic engine failure in cruise flight in a 767-300 ER. Instant loss of all thrust. In cruise flight it’s actually a very benign maneuver. You would have to be dead asleep to let it rollover. It’s also unlikely a rudder hard over would cause a upset as rudder travel is limited by dynamic pressure at cruise speeds. Rudder hardcovers normally are a problem at low speeds where full throw is available.