When I was towing and working on my boat myself (260 Mercruiser) I would always test forward / reverse while running on the muffs to be sure the boat would start and shift properly at launch time.
It's all been mentioned above: make sure prop is clear, don't run above idle speed and let the prop come to a complete stop before shifting into the opposite direction. Didn't want a surprise on the ramp, never had any issues.
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