This is my first router but I'm not new to the hair pulling
I don't live in the US so I am not sure 8020 means much over here. The slots are slots so you can always bolt a rail over them I just think a doubler should be used to ensure a flat surface and full contact area, I'll also mill it so it has an edge so I can have a reference slide as per the THK recommendations.
"Maximum overkill" may be the name of my router I suspect.
Graham