If you create territories that clown preffer to live in (anemones) then you are almost guarenteing that two will pare up and host (if they would even host) and the others would want to host as well but would be pushed/bullied by the larger maroons, and even if they hosted, and if you had a second and they hosted, you would still have an odd one out who would be picked on by the others in the tank.
As for preventing fighting, thats kinda up in the air, they may be fine so long as they cannot develop territory, they may be fine only for a short term untill the rest hit adult size. But assuming with enough hiding spots and proper feeding they shouldnt hate eachother to much... but that being said they aren't predictable so in the grand picture the only way to know is time.