Im not certain, but my guess is the fast travel spawn points are inside a perimeter where you arent allowed to build your camp. I know you arent allowed to put your camp inside known areas

From what I’ve seen, the spawn point has **something** to do with where the actual CAMP device is. But I’ve never really bothered messing around with it too much. Spawning under a wooden foundation once is enough for me to be happy with wherever Godd Howard decides to put me.  

If I put my C.A.M.P at a location that is in the direct spot where you would spawn into if you fast traveled, would that person spawn inside my C.A.M.P or would the game put them next to it or load them in a completely but nearby spot?

Does a map location have multiple spawn points? Can someone spawn inside my house at my C.A.M.P