Destructible Mesh, Debris Damage

Hello People, i need help with a specific thing about my destructible mesh.

So i have a wall, which has a total of 48 cubes on it and each cube is destructible. But when i hit the one a the top of the grid, the debris falling down destroys all other cubes under it. I need the debris falling or exploding without causing any damage to anything around it. Should i create 48 different blueprints for each box? Or is there any debris setting that i can manipulate.

My scenario is like this: i am shooting from a cannon, and using psyhics (not projectile movement) and the ball must hit cubes to reveal prizes or noneā€¦ And i dont want the debris to destroy other cubes around while breaking apart.

thanks for your help!