Placing an HDMI switcher before TVS input?

Here is what I'm trying to do.

We are hosting a Gaming Tournament. It is a 4v4 Halo tournament.
So there will be 8 TVs/Xboxs

I would love to be able to show footage from each player through the TVS.
So I would like to setup an HDMI switcher before the feed goes into the TVS.

Since the TVS only has 4 HDMI inputs I cant show all the players with just it. Plus 2 Cameras take up 2 ports. So basically I have 2 open ports on the TVS(Don't want to deal with SDI because too expensive to convert)

Here is an example. I tried using a simple cheap switcher i bought online and the ATEM never shows anything. but if i plug switcher into a TV it works. All of the items going into the switcher all work by them selves in the ATEM if plugged direct.

wIRE-dIAGRAM.jpg (72.08 KiB) Viewed 1280 times

and if U put XBOX directly to TVS , is it works ?

What resolution and frame rate do you use?

I'm working with 720p50 in Europe and the XBOX seems to output this while in the menu. When I enter a game it changes to 720p60 (It was rockband I think). So I ended up with 720p59.94 for the event I've had an XBOX.

Perhaps you can force the XBOX with an EDID emulator. But I didn't have one at this time...