How many networks should be implemented

Working with multiple networks is important to increase competition for ad inventory and drive up eCPM and revenue. However with more networks comes more operational overhead to manage them. The number of networks you use is dependent on many factors of your app, like diversity of ad units and distribution of users across various countries or regions. 

Each network has its own strength. Some networks have stronger performance in specific countries or regions, while others have stronger performance in a specific ad unit. The number of networks you implement will depend on your app’s ad unit mix and location of your user base. If you have only one ad unit and the large majority of your users are centralized in one region, you should implement 3-5 networks. If you have a wider range of ad units and your users are spread across multiple regions, you may need to implement 5-8 networks.