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This won’t give you the audio information that Paul suggests, but I bought an old still camera flash unit from the 1990’s era ($5.00 on eBay) and trigger it toward the cameras. This gives you a single-frame of white. Add the Paul’s hand-clap to this and you have a foolproof method for syncing sound and image.
I have found over many years of shooting theatrical events that the most precise way of syncing multiple cameras is to a foot-fall, a moment where you can see the left foot of a dancer, for example, as it touches the stage floor. You can tweak from there as necessary.