I come at this subject from another mindset altogether, before I start the engine / engines on any flying device I confirm " clear to start "
In a single pilot operation I personally confirm that it is clear and in a two pilot operation which is mostly what I fly it is manditory before engine starts and must be confirmed by both pilots.
And no I do not shout " Clear Prop " before hitting the start switch.
Having determined that it is clear to start, shouting " Clear Prop " would be unnecessary redundancy........
Chuck E.