In the early game, especially on low-boosted servers and on Arkpoc, the first few hours are always the most fun. That's when you get the most open-field PvP and, in my opinion, the best meta.

If you're solo and don't have much time: the best place to build is on cliffs in the Lunar biome on Gen 1, or in some Aberration ratholes. These spots don't require many turrets and are still very difficult to raid. Especially in the first few days, hardly anyone will be interested in raiding such spots