This can be done in MyGeotab by going to Administration>Reports>Select the default report you would like to set up to be emailed. Then click on the Email report tab. Turn email options ON, then select the date range as This month or Last month depending on what you would like. If you would like to have the report emailed out every month, for the refresh period you can select monthly (or whatever else you would like). For the next run select the date and time that you would like the report first to be sent. For the recipients you can either click email the report to me, or create a group that you will have to add users to and then select the report to be emailed to that group.
What kind of information were you looking to get for your units? Let me know please and I can help suggest which report would be suitable.