I would not use mobile redirects from
Plugrush, if you want to be on google.com. You can set alternate ulr of popunders to any other website that you want to promote (could be yours or with an affiliate link, which I would not do), or something like url for selling skimmed traffic to
Traffic Shop..
Ero Advertising is the best place for popunders, as they pay relatively good, and most of their popunder ads open up to 4 times per 24 hours for the same ip.
Make sure you have a mobile version of the site. Responsive design is not 100% good. Then work with programs like
Bitter Strawberry (they are very good), and
Sex Goes Mobile, and mix it up with mobile popunders from
Plugrush.