The only ones I have used are the metal ones. With those you need the proper sized grommet setter for each size grommets. That makes sure the rings stay in place while you hit the setting tool with the hammer. If you don't hit it firmly and squarely on, then they may come apart. I usually bang several times to be sure everything is secure, especially when using the larger grommets.
You can also check with a shop that makes signs and banners. They will most likely have an industrial grommet setter that works much easier than the home use one.