Question ARCore and Photon Networking

Hello everyone! I really need help with Unity ARCore and Photon (PUN2).
I made a program for placing furniture prefabs in the room, everything works. I want to implement a network interaction.
With PUN2, users can enter one room. I spawn an object on the scene, can delete and rotate it.
However, have problem with a positioning. The position of the object can be different on devices. Can it be just because of light or the room's size?
Maybe it would be better to use "cloud anchors" or even just "anchors"?
Help me, please, thank you.