Cross account multi region patch management

Greetings, everyone. To summarize, I am seeking to implement a centrally managed patching solution for EC2 instances across multiple regions and accounts within my organization's environment. It is important to note that our infrastructure is entirely cloud-based, without any on-premises components. As someone who is relatively new to this area, I have made various attempts, but I have encountered difficulty in achieving a comprehensive, unified view of multiple accounts through a single interface. Any assistance provided would be greatly appreciated.