What is the best way to perfectly square (tram) your router to you CNC bed?

What are the best ways folks have found to perfectly square the router to the waste board?

I used Paw Paw’s method yesterday. Back in January, I squared mine with a construction square. Spent a LOT of time doing it and assumed it was spot on. Boy was I wrong. His way is quick and accurate. I even made a jig for the measuring stick. Here is his method:

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I also bought a metal mm ruler at Lowes to make sure my 880mm front and back were EXACT: