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You would buy the foam and drywall separately. You can either glue the entire thing together or glue the foam and use tapcons (concrete screws) to attach the drywall to the wall (screws go through the foam) if you want to do something without giving up space… hang a tapestry? lol
USB hub? I have a spare of USB c, mini, and micro running from a hub to a 3x cable mount on my desk. Makes connecting peripherals a breeze.