If you can afford to host those websites on different hosting providers, feel free to do so, it wouldn't harm.
With the introduction of CDN sites such as CloudFlare, owning websites on different C-class IPs does not make much sense anymore. As long as you are not using the same whois info and literally the same template/layout, you can treat those websites as if they were owned by different people. As simple as that.
Quote:
Originally Posted by Hinc
Generally though, you want incoming links from quality places that are not your own ... quality over quantity when building - relevant links preferably - social signals where possible - variety in linking methods etc....
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I could not agree more. Hinc was very right - you should always prefer quality over quantity.
Speaking of links - contextual links are by far the best. But if you can't do that, try to keep linking from the main pages if possible. Sitewide linking is something that I don't recommend too often. But at times even such linking have its own benefit.
Though I've been very busy lately, feel free to hit me up on PM if I could help with any other advice. Sharing is caring!