AR foundation spawned Object stability

I have a project in AR , creating some scene relatively to the Users position in real World but whole scenery which is generated does not have any stability regarding its position .
I can place it on one spot ,turn around and the scenery moves , how to achieve better Positioning and stability of placed objects in AR ?

I think most accurate positioning way is batch object on the detected plane with raycasting which means it need to be wait for detect any planes by device via ar foundation plane manager.

Plane detection looks really of in my project , do you know maybe how to set plane detection type ? where shuld i go so i can test it ?
thank you for the help and ytou time .

I strongly recommendation to figure out how to use AR Foundation entire functionalities

here -> Unity-Technologies/arfoundation-samples