Position of the object in a room

Good morning everyone,

Ho questo problema.
Ho 2-3 oggetti piazzati sul pavimento da muovere nello spazio dentro la stanza in una relativa posizione.
Io vorrei capire per ogni oggetto se si è mosso e dove è stato posizionato sul pavimento.
Qualche suggerimento sui sensori e comunicazione da utilizzare ??

I have this problem.
I have 2-3 objects to move placed on a floor in a relative position on the floorinside a room.
I would like to understand for each object its position and if is placed in a relative position on the floor.
Any suggestion to sensor and comunication to use ??

Can the objects be place anywhere, or only in specific "allowed" spots (like a chess board)? With specific spots perhaps you could have pressure pads or switches.

No should be a specific position on the floor..

So then maybe switches of some description, which could be an upward pointing IR proximity sensor for example.