How do I detect niagara collisions, or how to make a grid of line traces

So simply enough i would like to detect when a object has been hit by a Niagara particle. When i search for this i keep coming across this video, UE4 - Niagara Export Particle Data to Blueprint - Collision - YouTube. unfortunately this doesn’t really help me as I need multiple objects to know if they have been hit out not. The system i am making is a weather system and i there are player spawned objects i would like to show the effects of weather (ex: getting wet). those same objects should not get wet or start drying out if they are covered by other objects.

If it is not possible to for objects to detect hits from collision with Niagara particles, How would i make a grid of line traces? this way i could just project them all down and whenever the objects that need to get wet or dry out detect or don’t detect the hit from the ray trace they can do what they need to do. I have found a video on how to spawn actors in a grid but i am unsure how to do it for line traces.

If anyone could point me in the right direction i would appreciate it.