A 24/7/365 Managed Security Operations Centre and Detection Response Service, including implementation support

We are looking for a partner who can help implement and monitor a managed security operations centre solution, and respond to security events as they arise. This solution will be a common platform to provide visibility of security events from multiple sources in both the cloud and on-premises environment of the contracting local authority. The service will also provide a 24/7/365 monitoring of the platform and will take agreed upon delegated actions within agreed SLAs based on the categorisation of the security event. The solution should be based on M365 technologies that allow source log files to be held within the Local Authority. (this update was suggested, but I want your advice on it.)