The best dashboard in Service Analytics for UC's service reportrequirement is Sidebar-By Customer.

To create a service report containing references to 50 objects, Universal Containers should follow these steps:

Create a custom report type: This allows for the definition of primary and related objects.

Select up to four object relationships: This structures the primary relationships needed for the report.

Add fields from additional related objects: This extends the report's scope to include up to 50 object references by pulling in fields from other relevant objects.This method provides a scalable approach to complex reporting needs within Salesforce.

References: https://help.salesforce.com/articleView?id=reports_defining_custom_report_types.htm