You can set this up within your Meridian account! Once you are logged in, select the Account tab from the left-hand toolbar and choose the Report Downloads option. The top section, Ad Performance Metrics is the exact report you are looking for.
You can download reports by site and it will populate request, impression, fill rate, CPM, and earnings metrics for each tag. You have the ability to separate out domestic and international traffic for each zone as well.
If you would like, you can also get this download sent to your email each day by selecting the Add Email Report button. If you would like assistance in setting up these automated emails please do not hesitate to reach out directly at firstname.lastname@example.org.