大量のオブジェクトを簡単に物理演算やマウスで直感的に配置したりマージ＆最適化などが可能なUnreal Engine 5.5向け無料ツール！ Mesh Optimizer Champ by Metal Donut #UE5

Use packed level actors or some other auto-instancing tool. You'll quickly fill up your disk storing all these unique meshes, occlusion culling is useless without nanite, and there's many other reasons to not do this.

I think that is a good idea.I am also operating with a Packed level actor or instance.The author of this tool recommends a merge mesh, but I think the use of that is limited.