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This is a paid asset, but now you can download Boundary and Prefab Tool Free.
Detail this asset from Unity Store: Original Link
Boundary and Prefab Tool v2021.4.23.0 (Latest version)
Streamline your design process with custom collider meshes and smart prefab management.
This extension quickly creates paths upon existing geometry in a scene, and automatically places prefabs along the created path.
Customizable placement settings to fit many uses.
Prototype quicker by instantly swapping placed prefabs in a scene.
Save design time creating large scenes.
Custom Collision Mesh
Smart Prefab Placement Tools
Terrain/Collision Support