welcome to the forum, is it possible to share some photos of what you have ?
I would just use 4 quick-release Workmate clamps to clamp the feet of the router table to the table.I have a Ryobi folding work table, which is plastic and has honeycomb beneath, so its a couple inches thick
and does not have a smooth under-surface.
Looking for a way to fasten & unfasten the router table thru the provided holes in the workbench, quickly.
Something like a 3/8" tee shaft that goes up from beneath, with a cam lock above.
Or a half-threaded bolt with a similar nut that can be dropped down & tightened with a half turn.