The second largest traveling Agency is one of my clients, and they rank #1-5 on Google for the terms they want.
They have different sites/brand-names for each niche, but all are travle-related.
All sites(35+) use the same load-balancer, so any Searchengine will see it as hosted on the same server.
So how much does different IP's matter these days? I dont know your business-model, but 95% of you are better of saving $$$, by hosting it all on the same box/cluster.
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