Desactivate Collision in structures?

Hello, I’m trying to deactivate the collision in structures like stone, wood, metal but I can not do it, I have deactivated the collision check but I still can put the structures against an irregular wall, can you help me? Thank you and sorry for my English

It’s too easy to do that, I’ll give you an example:
On this occasion, the foundation searches for ‘’ Floor_Metal ‘’, then you will do it and in the ‘‘Placement’’ tab you will find an option that says ‘’ use placement collison Check ‘’ and deactivate the box and you will not have any more collision