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If the sine waves don't line up, you are in for a very bad time. There is a reason crossover switches exist, please never do this.

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That won’t happen since the inverters are all tied to the grid frequency

You think they are, but you have to trust that this happens. And even if they are, what happens if the grid is offline and comes online while the inverter is operational, how long does it take, if it does at all, to adjust itself.

If the product doesn't explicitly state this on its packaging there is absolutely a chance for competing sine waves. If this wasn't the case, transfer switches wouldn't have been invented. The original comment I replied to is simply dangerous.

There is circuitry to prevent this.

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