For making a few signs using one of my routers, my research settled on the lettering guides from Rockler. They snap together and then you tape the assembly to your work, positioning it to your satisfaction. Then a plunge router with a guide bushing is used to follow the lettering of this assembled template. Other brands of lettering templates required the use of a frame into which you place the letter templates, and this frame just got in the way for me. Using the interlocking letters from Rockler and tape to hold them in place for routing was much easier. Rockler sells number templates too, and a version for routing numbers vertically.
Central North Carolina