Thanks @JosefFinsel for sharing the feedback.
In the current version of the server, you are correct that a Managed Schedule can be created to recur after Minutes, Hours, Days, and Weeks. You cannot configure one to run for a specific day of a month. Currently, customers have been using a 4 week recurrence value for their monthly reports.
With that said, I would like to hear from other customers about the need for a Monthly recurrence level to help with prioritizing this feature with the product team. Please add your comments here if you would like us to add a Monthly recurrence in the Managed Schedules.
We are tracking this internally as case 173863.