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Sabrent Premium 4-Port USB 3.0 Hub for iMac (2012 and later)
Apple iMac (27-inch, September 2013) review: New processors and faster Wi-Fi for Apple's slim desktop - CNET
Amazon.com: SABRENT Multi Port iMac Hub with Front Access USB Ports, SD/Micro SD Card Reader, 3.5mm Headphone Jack and Rear HDMI 2.0 Output (iMac 2017 to 2020) (HB-SIMC) : Everything Else
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iMac | 3.2 GHz Core i5 | 27 Inch | Late 2013 - Techable.com