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Getting a grip on the surface good enough to give you the control you need in the presence of sawdust is a lot harder than it looks at first glance. You might be able to make it work by putting a big magnet on the underside of the surface to attract the router, though.

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It would have to an extremely powerful magnet though, since it can't be right below the router.

It could if had its own set of wheels+servos. But it would still have to be powerful enough to attract the router through the surface.

I think that the magnet idea could work if you added 3 electro-magnets to the router chassis and made another chassis (to ride around underneath) with 3 corresponding ferro magnetic pads.

You could just have removable weights on it. Suction feet is the other obvious one.

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