Hi Erik!
If you understand me well, I'm trying to make a waterfall of 3 adx tags passing back unpaid impression one to each other, all of those tags have different cpm rates.
The problem is:
1. if I put first adx tag with for example 10 usd cpm on the webpage where i have an adunit, than to create a passback tag i have to create another webpage and by google ads policy the page cannot be without content.
being processed through the first 10 usd cpm rate tag there will be fillrate of 2-3%, than i passback unpaid ad requests to next adx tag with 3 usd cpm rate with fillrate of 20-30$ and so on.. you got it?
I used to work with a scheme you told me creating an artificial blank webpage to place next adx tag, but google doesnt allow to place ads on the blank webpages.