On adscpm.net not found any guidelines.. Pop Under ads are provided not only by specialised popunder networks. For example, fidelity media deserves a chance to try.
Popads, Edomz, Popcash - those are primarily pop-under networks. It's better to try several and choose the best fitting one for you.
For pop under edomz and popads are well known for their reputation, if none of them accept you then you would be looking for other options Adversal is known only for cpm banner not for pop