Once you are up to sizes like 27' most people treat the pool as permanently installed, which means PVC plumbing instead of hoses and hard wired electrical connections, instead on plug in. If you are using PVC plumbing and hard wired electrical you should use an in-ground SWG. If you have hoses and a plug in pump, then the Aqua Trol is a good choice.
The Aqua Trol will work with your pool. I like to oversize the SWG a little more than that, but that shouldn't be a big problem.