Many peoples bulding their "seo empires" on "seo hosting" with 10 or more IP but at the same DNS! and they think it was invisible for google. LOL
If You bulid for example 10 wp article blogs on different IP but the same DNS and linking to it among themselves... you risk more that you think. Google well know that seo backstage method.
Google is not perfect, but not stupid
So simple conclusion is:
If You care about Your seo backstage think about host with multi DNS option