Hammer, frogspawn, goniopora, duncan, leather and any coral that has long appendages. They might damage the coral from nudging and wiggling on it. A larger coral would take the abuse better.
If it takes more than a couple of months to adopt anything, they probably dont feel very comfortable for various possible reasons or they're not interested in what you got.
I've had all sorts of corals plus anemone and my clowns wouldnt care and would just hover in a spot in the tank. On the other hand, I've had clowns that would love to completely disappear inside a hammer, frogspawn or anemone.
The right species of clown is the trick. Ocellaris are the trickiest to adopt an anemone or anything else, the percula are more susceptible to adopting anemones and corals but are a bit aggressive towards peaceful fish. Other clowns are even more fond of corals and nems but might be much more aggressive.
Not all anemones wonder around that much, some will stay on the bottom like carpet anemones, it will depend on factors such as light and flow, among others. In case you consider an anemone, Its important to research into what type of anemone best pairs with your clownfish to increase chances of success.
Good luck!