The mounting on most routers is done with three small, fine thread bolts that go through whatever you're mounting the router to, and into the router itself.
I think you might consider making your own router table. Very easy to make using a nice flat piece of ply. The money you save will allow you to buy something like the Bosch 1617 EVSPK kit with both fixed and plunge base. Search the Forum for shop made router tables, lots of instructions. The Bosch fixed base will mount under the table and you can buy a small key that will allow you to adjust the bit height from above the table, a great convenience.
You will need a fence of some sort, and a really straight length of 2x6 will do fine. You clamp it to the edge of the table. You can get acceptable clamps from Harbor Freight.
At any rate, welcome to the Forum, we love to be helpful to anyone new to the hobby. I'm gong to attach a pdf that covers the many things I've learned over the years, with suggestions, hints, tips and cautions. It's kind of long, but has pictures. It may save you a few missteps that I've made.
The more I do, the less I accomplish.