Hi Sameer Khandar,
Thank you for connecting with us in the Microsoft community.
According to your description, I have limited information knowledge about to deploy workspace, but initially I have found below official documents according my search if it may provide some possible and suitable information for workspace related scenario.
For workspace:
Prepare for multiple workspaces and tenants in Microsoft Sentinel | Microsoft Learn
Geographical availability and data residency in Microsoft Sentinel | Microsoft Learn
For Data Collection Rules (DCRs):
Data collection rules in Azure Monitor - Azure Monitor | Microsoft Learn
For Event Hub:
Stream Azure monitoring data to an event hub and external partners - Azure Monitor | Microsoft Learn
Azure Monitor: Send monitoring data to an event hub | Microsoft Community Hub
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Seems like your concern environment is associated with Azure or Microsoft Entra portal for workspace related concern, I was consulting your case with my team members, I would like to share some more specific information with you, actually Microsoft has separate community channel resources where our related most valuable professional and community members can provide possible information for certain different support scope resources platform, so would you mind to contacting and placing your concern on our dedicated separate Microsoft Q&A community channel?
Actually, this community does not focus Workspace related concern which is associated with Azure or Microsoft Entra service platform, because we are mainly focusing pure Office 365 exchange online license service and email flow with in Office 365 admin center related scenario on this community.
However, there is an another specific channel for your mentioned concern where you may get some possible information for certain specific resources and platform from our related community members.
Hope, I have provided official document required and correct community platform for your provided concern.
I would really appreciate your precious time. Thank you one again for your kind cooperation and contribution.
Have a good day.