It is important the clamps remain square to the mounting plate as this will affect you cut if the router is out of square. Once square you can mark the holes by lightly drilling through the plate and into the clamps. I enlarged the holes to 1/4". after the holes are marked, you can drill the rest of the way through the clamps
Finally you can install all the hardware on your mounting plate (v-wheels & delin nut). Then you can install the clamps by using 1/4" socket head bolts. they have to be socket head so there is enough room for the thread rod to clear.
check out the video if you looking for duct collection ideas!