Satechi has designed a new USB-C hub specifically for the 2017 iMac Pro and iMac.  The hub clamps on to the bottom of the iMac and plugs into one of its Thunderbolt 3 ports to add forward-facing ports to the bottom of the screen.  The Satechi Aluminum Type-C Clamp Hub adds one data-only USB-C port, three USB 3.0 ports; all USB ports have speeds of up to 5Gb/s.  There are also MicroSD  and SD card readers with speeds up to 104mB/s.  The hub is available in silver or space gray colors.  The Aluminum Type-C Clamp Hub will be $49.99 and will be available starting January 5, 2018 at Satechi and Amazon.
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Looks like it blocks cooling vents…