There have been posts saying it's not a problem, and there have been posts saying the hotels charged past the first device, and there have been posts saying there was a limit of two or three devices.

So I think it pretty much depends on the hotel, so it's best to check with them to be sure.

Example of somebody who says they were charged for all but one device

http://www.flyertalk.com/forum/hilto...same-room.html