How would i go about spawning custom meshes with a procedural terrain?

Given a procedural hexagon map in Unity, I am currently just connecting all the hexagons with triangles and quads that i generate at appropriate points using vectors. It's pretty much this here by catlikecoding


I was thinking instead of having these sharp cliffs, i could spawn custom meshes like in Endless Legend on the walls instead in order to create prettier landscapes with those custom cliffs.

Question is does that make sense? Can i just instantiate prefabs filled with custom meshes and materials and have it work? Are there better approaches to this goal or does anyone have experience with such things?