Workbenches, campfires, resin based torches & wards all provide an anti-spawn radius effect. Campfires, torches & wards can be buried, workbenches can be built out of sight in trees (sometimes a flooring piece is necessary).

None of these will eliminate invasion events from occurring against your base. To prevent damage to your base and its structures, build a killing pit outside the walls of your base (earthen raised walls work best as they are indestructible). Dig a hole, not quite as deep as a troll is tall, but leave a raised portion in the middle so it resembles a donut. The moment an invasion event begins drop everything and run outside your base to your killing pit, stand on the raised area in the middle and pick off enemies at your leisure.
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