Hi there, i guess this is pretty relative compared to your alternatives.
I would suggest to take an actor, configure it and duplicate a decent amount of them in your level. (just a few alt+drag when selecting a whole duplicated bunch over again). If your profiler doesn’t burn, i guess you should be good 
This is what i did with the Menger-Sponge fractal: Over 6000 actors, all of them with overlap events, and ingame there are about 20 pawns speeding around on the surface where every pawn overlaps with about 4 of them. No issue at all.
hth Marooney