Big 2D map


I want to create a “big” map for my first 2D game, I already create the actor and the blueprint that goes with but I have to place on a 160x320 area. I saw that with the “tile map” we can do this very easily but I have the impression that we can not make separate interaction “tiles” (the blocks must be dug, and therefore disappear, at as the game progresses).
Do I have to manually place each of the actors or is there a way to place a large number of them quickly?
I also made a loop with a “spawn actor” in the “level blueprint” but the loading is very long as soon as I want to start the game.

I hope I made myself understood despite my bad English and thank you in advance for your help