Welcome to the forum.
If your plate is a Rousseau they sell a template that makes installation a snap. Otherwise the attached PDF file is one method that might help. I have seen a few methods on the internet while Googleing around but I can't remember any of them right now. Just do some searching around and you can probably find some other methods.
I did find this one by searching on Google (router insert template) :
www.theroutermaniac.citymax.com/page/page/3780435.htm
If your plate is a Rousseau they sell a template that makes installation a snap. Otherwise the attached PDF file is one method that might help. I have seen a few methods on the internet while Googleing around but I can't remember any of them right now. Just do some searching around and you can probably find some other methods.
I did find this one by searching on Google (router insert template) :
www.theroutermaniac.citymax.com/page/page/3780435.htm