How do I import a wall of bricks with Individual Bricks responding to Physics in Unity?

So i want to have walls of bricks that things can collide with and when they do , the bricks should all go flying out with each brick having individual physics?

How can i do this?

My program is DAZ. Would i just make a wall of bricks in DAZ and save as FBX and then in unity all the bricks will already have rigidbodies? Or do i have to apply rigid body to each brick in unity?

I want to say now, i tested it just 5 minutes ago. I made a brick wall in DAZ Studio. Parented all the bricks to one brick so that can move wall as one.

Brough as FBX to unity. set RIgidbody to the whole wall, and it doesn't work. The wall falls through the floor. I even unparented one of the bricks and put rigidbody to it, and it still goes through the floor. Even though another SPHERE i added (individual sphere from the Unity menu), does follow physics and does not go through the floor