Charms can be brought up on any and all monitors connected to the system.
My PC is connected to my 55 inch and the only time I use my 55 inch is to watch movies. So it doesn't help that I can bring up the charms bar on both monitors but thanks for the input.
Also, you could modify your secondary monitor/TV to be slightly above your main monitor so that when you move your mouse cursor to the bottom-right corner, it will get "stuck" instead of moving onto the second monitor.