Snapmirror for multiple DR sites

Currently we are focusing on Snapmirrors for multiple DR sites and I wanted to see if anyone had any best practices for this? I have 2 sites that currently snapmirrored and I have a DR site SnapVaulted, and I'm looking to add another additionl DR site. Any Issues (scheduling, overhead, pipeline)  I may run into? Anyone have any advice for me with this situation.

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