Thanks for your replies, much appreciated. Do you have any solution you might be able to suggest in my situation please? There might be an obvious solution that I'm overlooking.
Basically, I have a projector setup with an acoustically transparent screen, and all my AV equipment is behind the screen. This comprises of an AV Receiver, PS3, Nvidia Shield TV Pro and Roku player. The AV Receiver is an old sony one, but I'll soon be upgrading to a Denon AVR-X2700H AV Receiver, which is HDMI 2.1, etc. My projector is a JVC DLA-X700, which is a 4K e-shift projector. All of my media devices go to the AV receiver, and then a 10m 18gbps HDMI cable goes to the projector, which is all fine.
However, this November I'll be getting a Xbox Series X and LG 48" OLED TV, and I'll be putting the TV in a different section of the lounge to the projector screen / setup. What I was wanting to do was have the Xbox with all my other AV equipment, behind the projector screen, and run it to the Denon AVR and make use of the dual HDMI outputs on the AVR, with one HDMI cable going to the TV and one going to the projector. I'll keep the existing HDMI cable to the projector, since 18gbps will be more than enough for that. However, I would need a 10m 48G cable from the AVR to the TV, for when I used the Series X input with the TV. I know that there won't be many games outputting in 4K @ 120Hz, but I want to have the setup right and ready. I've heard that there are some titles already announced for that, which if I've researched correctly 4K @ 120hz would need a 32.27 Gbit/s capable cable.
If a 10m 48G cable isn't feasible, the other solution would be to have the Series X next to the TV. I'd then only need a short 48G cable, because it's only if I'm going from the Series X -> TV that I'd make use of the bandwidth. I'd then have to run 2 x regular 18gbps HDMI cables between the TV setup and AVR; one from the Series X -> AVR (when I wanted to use my Series X with the projector), and one from the AVR -> TV (when I wanted to use my other media devices with the TV). That's a little bit of a hassle, because:
1) I'd have my Series X not in the ideal place. I've got a Cyberpower UPS behind the projector screen you see, which I wanted to plug my Series X into. I suppose I could get a 10m power extension, but then it's getting even more convoluted.
2) I'd have to switch the HDMI cable on the Series X every time I wanted to change the output from the Series X to either the TV or the AVR (which in turn, to the projector). Not the end of the world, but not ideal either. I don't know if there's a HDMI switch that's 48G compatible, to at least save constantly yanking a cable out and plugging another in, but I'm already doubting it.
So that's my setup and what I'm trying to achieve, but I don't know if I'm missing some really obvious solution?