No, they will generally pick an area of your tank and gravitate towards that location, but since they generally are not going to have any predators in a home aquarium, there's no need for them to have a host anemone or any other such creature. Some people will add anemone-like creatures in the hopes that their clownfish will use them as a host, but this is also not necessary. If you would like to try something like that, some common surrugate hosts are any of the Euphyllia genus (Hammer corals, frogspawn or torch corals), toadstool corals, or many of the various species of mushrooms. There's never any guarantee that a clownfish will use any of these (including actual anemones) as a host.