Canada is a strong Tier-1 GEO, so it is worth choosing networks with good rates specifically for this region and support for various formats (banners, push, native). Before testing, I looked at the review roiads — I recommend read guide, which lists networks that work well with Canadian traffic, with a description of the conditions and formats. This helped me choose several options for A/B testing and increase my average income without losing the quality of the site.