Suggested email solution for Apple Mail to manage across ALL devices - specifically a) managing unwanted junk email and b) setting rules to apply to all devises.

As info:
I found that when I set a rule up with my Macbook, the rest of the devises wouldn’t see the rules kick in until I turned on my Macbook.
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This is exactly right. Rules set up in Apple’s Mail program do not apply to other devices UNLESS the application is open and running on the Mac back home.

I think what’s happening is the Macbook sorts the emails out and then the other devises simply sync to the MacBook.
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Yes.

I’m assuming I need to set these up at the source somehow but not sure how.
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You can’t set up rules on iOS devices. They are slaves to what’s on the server only. No colors, no rules. You can flag and that’s it.