A Denmark based website directed at the people in Denmark can benefit more if it uses geo-specific traffic. This means that they can better business if they promote their website to people in Denmark only. Promoting it to people in other country would simply be a waste of your resource. Using the right advertising source and the right network would be more beneficial. You can buy popunder advertising in Denmark as that can help you to get a good traffic and can promote your online business more efficiently.
When you buy popunder ads then you are making use of indirect display ads where you get to use the ad to draw traffic from other website and promote your own website. Since you use display ads, they are noticed by the target consumers easily. When you place the popunder ads with Denmark based network then you are able to advertise it to the people in Denmark. They may find your popunder ad to be attractive and more useful. In this case they are likely to visit your page and this would help in increasing your traffic and get more business. Using popunder ad traffic in Denmark is very beneficial and is cost effective.