Outlook solution 50+ email accounts?

I'm looking for a solution for the following: I have about 50 email accounts that I want to manage from a single interface. I'd also like to add some rules so that certain messages containing, for example, a specific word in the subject line are automatically archived. In Outlook Classic, I can only add a maximum of 10 email accounts. Or rather, I can add 50 accounts, but messages from only the first 10 are loaded via IMAP. Is that correct? What's the solution if you have, for example, 50 email accounts? In Outlook Light/365 (1.2026.114.100), I can add more than 10 email accounts, but the order of the accounts can't be changed and creating rules is not possible.

Does anyone know a good solution?