Question about modded worldgen prefab spawns

[HUGHESMI]

I recently started messing around with worldgen, and my modworldgenmain currently uses AddRoomPreInit to add additional prefabs to the distributeprefabs tables of some existing biomes. However, the prefabs that spawn in are appearing on top of paths in a way that normal prefabs don't seem to do, which looks odd, but more importantly the prefabs seem to spawn in higher numbers on the paths than elsewhere in the biomes, which leads to an overall higher number of prefabs in the biomes than intended. Is there a way to avoid having prefabs spawn on paths like this?