How to target my traffic by geo.

Hello guys, currently i'm working with exo click, and they told me that my cpm is low because of the 3d world countries (i know that this is how it works), but they also told me that the fact i'm sendind 'low quality traffic" will also affect the cmp for the others tier 1. So, i need help to target my traffic, what i want to do is stop showing ads for tier 3 countries, and maybe use another network for these countries, i know that adsense have these options but i work with adult advertising, so i would like to know if there's any plugin that i can do this segmentation.
Thanks in advice.