Every pro GDN advertiser knows that mobile and desktop are never going to convert the same way. That’s why its super important to block as much as possible right from the start on your campaigns intended for desktop only.
To do this, you need to apply a -100% decrease mobile bid adjustment under the Settings > Devices tab on a campaign level.
Secondly, you want to click Display Network>Placements tab, and add in under campaign level exclusions for placements: adsenseformobileapps.com
That’s the two most important steps; but we’re not done yet – if we really want to maximize our ROI, and minimize wasting our ad budgets there’s one more step which is a must.
These are the SITE CATEGORY EXCLUSIONS
You want to click on a campaign, then DISPLAY NETWORK > +TARGETING TAB > Campaign Exclusions > Site Category Options and exclude:
Gambling, in game, gMob app non-interstitial, error pages, and parked domains.
This is what it will look like after you are done: