The ability to roadblock single or multiple articles is one of the most important reasons to use an adserver. Roadblocking is the ability to show particular ads on particular pages. If an advertiser wants to buy 100% of the advertising space on 3 articles you will be publishing in the next month roadblocking allows you to do that easily without contacting your web developer.
Giving yourself, as a website owner, this capability allows you to be prepared for future advertising needs.
What exactly do you need?
At a minimum, it’s good to have:
1) Single post targeting
2) Homepage targeting