Personal opinion, a pop up vent fan and good don't go together. If there's a way to do an overhead one, do that. It depends on what's above. There are some that come down sort of like a cone with the exhaust going up through the middle if you don't have it on an outside wall. Also, if you get one that has enough oomph to acutally do something, the duct needs to be fairly large as well - mine required an 8" round duct. Trying to move lots of air though a small duct gets noisey and inefficient.