How to Attach Granite to Table?

I have a granite remnant from my kitchen. It's roughly 18"x32"x1-1/8" and I plan to use it on the front edge of the table.
When the installers put the counters in my kitchen, I think they used an epoxy to attach the granite directly to the cabinets. There is a mesh net glued to the middle of the remnant piece already, similar to the counters they installed. Everything online seems to show a plywood top and then the granite glued on top using silicone. I was planning to make a 2x4 frame under the granite to support and attach to but now I am not sure. So what is the better way to do it? Plywood on a frame under the granite or just the frame?
The top will overhang the front and one side with a 3" lip. Therefore it needs to be attached somehow because it will be moved around on casters. I am a little worried about stuff getting in the gap between the wood tabletop and the granite. Thought about filling it with silicone or urethane. Not sure how the urethane will react to the wood expanding and shrinking. The wood counter will be biscuit joined and glued to make a solid wood surface.
I would be fine with silicone. Might be able to remove the granite piece later if needed.