Cpxinteractive Pop-under rates?

Does someone has any experience with cpx interactive pop-under rates?
I want to know some basic things about pop-under ads, for example, if a website has 1000 unique visitors and 10000 hits. how many times the pop-under ads will be shown? are they shown to unique visitors only? or every time ?
and what is the rate of pop-under ads? (i meant average rate to get some idea).
thanks.

Original post by apple