Here's an example: I'm buying blog posts on web hosting related blogs for my 2 sites: BlueHost Review and HostGator Review and I wonder if it is OK if I include 2 links for these 2 my sites in every article that I will buy? Then the title of the article could be e.g. "Web Hosting Providers Reviews". Or should I rather buy separate blog posts for each one of my 2 sites? - so that the title of the article could be e.g. BlueHost Review? - would this be better for SEO? If I could include both links for my 2 sites into every article that I buy, I could save half of my money, as I wouldn't have to buy 2 articles on every blog, but just one.