I agree with Charles on this. Offset the router. I have the Router Workshop table, which is offset to the left. Right, or left, either is fine IMO. Offset to the left leaves you a small work area which is all you will need most of the time. Turn the fence around and you have the larger area of the table to work with. This, IMO, is the advantage of using clamps to hold the fence down, and not t-track. Again, the clamps are what works for me. If you decide to use t-track for your fence, great. It is, after all, YOUR table. Use what works for you.
To your question, a removable insert to mount the router on, fence with dust collection, and offset from center.
If you do decide to purchase one, as Charles stated.. stay away from the aluminum one. In addition to being too small, the aluminum will leave marks on your wood. The RT1000 looks like a fantastic table. And, I think it's big enough that the router being centered won't make that much of a difference. I've used the Grizzly table and found adequate. The one I used was flat, so had no problems with it.
Sometimes I wonder whether the world is being run by smart people who are putting us on
or by imbeciles who really mean it.