Hi elfworks00
I would not recommend mounting the router just to the ring, it will be a pain from the get go, the 1st.error you will have the holes will not line up to the routers and 5 3/4" is a bit small, I would recommend using a stantard mounting plate, the Jessem are a bit high in price but you can get around that by using the one below,just buy two plates and use one for each router, then you can just drop the router in the pocket and go to work.
http://www.harborfreight.com/cpi/cta...emnumber=94331
============
JessEm 02021 4-Piece Tab-Loc Insert Ring Set
http://www.amazon.com/JessEm-02021-4...1677887&sr=1-4
JessEm 03100 Rout-R-Plate Router Mounting Plate
http://www.amazon.com/JessEm-03100-R...677926&sr=1-30
===========