I been having somewhat the same problem with structures.
How to check if the structure is a spawn emmiter. "green/red model" - ARK: Survival Evolved - Epic Developer Community Forums
My problem is that i need to prevent the 1st Begin Play event from beeing fired or have some logial code in it so it doesnt execute my stuff in there.
It really anoys me that it fires the Begin Play event when the structure is preplaced out.
If you find a solution. please post it since i need something like you do.