Review on Satechi Aluminum Type-C Clamp Hub Pro with USB-C Data Port, USB-A 3.0 Data, Micro/SD Card Reader - Compatible with 2019/2017 iMac & iMac Pro, Excludes 2021 iMac (Silver) by Mike Stevenson

Do not buy this product under any circumstances. I almost never leave reviews but I don't want anyone else to experience what I did. The wheel + clamp mechanism didn't work for me and seems really suspicious. It works by attempting to extend a pair of front/rear "clamps" into the bottom two vents/speaker ports while turning the wheel on the unit, which sure hides the mounting mechanism, but may not be desirable. Two skinny rubber bushings only cover the movable rear pair of brackets. Even if it works, the risk of scratching the bottom of your iMac pro is extremely high, as was the case with mine when trying to install it. I dare say that sooner or later even if these clamps were held, detaching the device would scratch the surface and again the risk of this happening is pretty high every time you (re)mount it. I would recommend one that doesn't attach to the bottom of your iMac but instead sits on top of your desk. The design seemed like a good idea, but the execution is very poor, and unless you're very lucky, it's going to scratch your finish sooner or later.