Question : Problem: Two Dell XPS One side to side

I will be buying a couple of Dell XPS One, for my kids, the very low end model.

But I was wondering if they will interfere to each other because the mouse and keyboard are wireless?
The computers will be like 40cms apart from each other....
(measured from monitor to monitor)

Answer : Problem: Two Dell XPS One side to side

I doubt it.  Most wireless KBD's and Mice have the option of several channels to communicate on.   If its the logitech pair, you can lock the KBD and mouse to the specific USB key.