One can easily bury both wards & campfires, even wooden torches, which are attractive items, work to stifle spawns (neither have to be lit to be effective). I place workbenches high up in trees, either in the crook of a branch or on a single or double floorboard. It is also a good idea to encase workbenches in small wooden boxlike sheds so they cannot be seen by enemies who wander into their area of effect. If they cannot see them, they will not try to destroy them. The previously posted video clip is the most comprehensive & informative source for items which will prevent enemy spawns.