This will work in any level with any Blueprint. If you’re using it on something without a skeletal mesh or socket, you can leave In Socket Name blank and it will just attach to pivot point of In Parent component.
Would you attach an image of what your setup looks like in Blueprints? Keep in mind that your Get All Actors of Class node is going to search for all Actors of Actor Class you select that already exist in game, and it will not work if you haven’t already spawned Actor.