I don't really think what user the account is hosted on at the panel or server level makes a bit of difference to google SEO, nor do I think they can detect that. What "might" factor, and I don't think it factors in now nearly as much as it did years ago, is having a dedicated IP for each of your sites.
The big no-no is duplicate site content. (i.e. Site A and Site B have the same content, google will penalize that regardless of you trying to hide it with dedicated IP's). Instead use 301 redirect for sites to send the user to one single site.