I used to use a fancy one of these from cast aluminum by, I think, Porter Cable, as an accessory when I was a cabinet maker. I couldn't find one to buy these days so made this one from MDO ply. Someday...I hope to talk my 'luminum working bro into machining one from 1/2" flat stock. I have my trim router on this just as needed.

It requires a flat surface to land it on but with proper adjustment of the router will level a ridgy spot like the one in the pic at whatever depth you want. I was removing the sawzalled ply/epoxy that used to be there. As you can see it is just leaving a tiny taste of epoxy still on the previously glued surface.