In this in-depth video, I’ll show you how you can use the PCG framework to place detailed desks with a lot of static meshes randomly placed on top. With the use of difference nodes and world ray hit query you will be controlling exactly where you want to place the objects to better shape the interior to your needs! 
https://dev.epicgames.com/community/learning/tutorials/nwdJ/easy-detailed-interiors-in-unreal-engine-5-3-pcg-framework