It's hard to mess this plate up, you have the template,,
take of the black plate of the router, tape it to the plate and check 3 or 4 times b/4 you dill the holes, use the holes in the plate for the drill size,,,take it the drill press or sit it on some scrap wood and drill and couter sink the holes...easy on the couter sink holes you want them just right...they line it up..
If you want to go the extra step make a plug that will fit in the hole in the base plate,drill a 1/4" hole in the plug, use that to line up the router dead on center.
Chuck up a 1/4" dowel pin or a true 1/4 bolt with out the head on it..
The take some screws that are the same size as the ones that hold the router plate in place, grind the heads off to a shape point put the screws in the router base ,set the router in place and with a small mammer, TAP the base,,,this will give you a point to drill the holes.. (they will act like a center punch but will mark all 3 holes at one time.)