Unique ip address for money sites when clustering pbn's?

I plan on buying premium shared hosting plans for my pbn's and clustering them in groups to link to multiple money sites of mine. Let's say 4 different money sites.

My question is should all of my money sites have their own unique ip address? Or is it safe to leave them all on the same shared hosting plan?

And if every money site should have their own unique ip address what's the best way of doing so? Should each money site be placed on a different hosting company or is their a better way to accomplish this?

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