Dreamscreen 4K setup - info needed before buying

Hello everyone,

I own a lightpack that is connected to my HTPC, which I can only enjoy while watching movies or tv shows. I want to expand that ambient backlighting to all my other devices. Here is my actual setup:

70' 4K tv with 3 HMDI inputs:

    TV HDMI 1: Yamaha soundbar / Caavo Control Center

    TV HDMI 2: Xbox 360

    TV HDMI 3 Google Chromecast

Caavo Control Center has one output and 4 inputs:

    CCC HDMI 1: TV DVR
    CCC HDMI 2: PSVR / PS4 Pro
    CCC HDMI 3: Nintendo Switch
    CCC HDMI 4: HTPC

Now if I plug the Dreamscreen 4K Hub output to TV HDMI 1 and 4K Hub input 1 to Yamaha soundbar / Caavo Control Center, 4K Hub input 2 to xbox 360 and 4K Hub input 3 to Chromecast, will all my devices have ambient backlighting? Also, how responsive is it? Is there any lag? I have LibreElec on my HTPC and the response is instant. I know  it's HDMI 2.0 with HDCP 2.2 and that it does support ARC but I want to be sure.

Is there a better way to connect all my devices together? That way I know I'll have two additional HDMI free ports (without backlighting).

Thanks guys.