The risk you mention would be very real with a 3-1/4 HP router. These units develop serious torque. Your Ryobi would not be a problem. Two layers of 3/4" plywood is a bit of overkill. Let me suggest you click on the link at the top of our home page and visit Oak Park, the sponsor of the Router Workshop. There you will see a very good table design, it handles just about anything you throw at it. The table is constructed with 1/2" Baltic Birch plywood, the table top is 3/4" BB plywood laminated on both sides with Formica. This design has withstood 14 seasons of television shows with 3-1/4 HP routers. I believe the plans for this table are $4. You can build this yourself without the phenolic plate, simply rout the size opening you need half way through the top. The real beauty of this is should you change your mind you will be able to easily mount a plate in place of your through holes. Baltic Birch plywood has many fine layers and is much stronger than your average birch plywood found at a home center. You can purchase this from lumber yards or woodworking specialty stores like Rockler or Woodcraft.
"Living in the D" (this means Detroit!)
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