It looks like you're using a double row angular contact bearing, although the dimensions aren't standard 5205. The problem with most double row angular contact bearings in this application is they have a small amount of clearance, so there will be axial play. Not much, probably not a big deal if you're just making a router to cut wood, but if it's any machine more serious than that you'd be better off going for two bearings so they can be preloaded. You'll also get a stiffer arrangement using a pair, as they can be spaced out further, which will help increase the critical speed of the assembly - again important as that's probably the reason you're making this.