Well, they give different results for different users at different times. For me performing it just now on mobile, of the first 10 results, only 4 were usb 3.2. Most of the less relevant results were the sponsored results amazon inserts all over the place these days.
Following that, in order, were the following:
https://www.amazon.com/Powered-LEINSIS-Individual-Switches-A...
https://www.amazon.com/RSHTECH-Individual-Switches-Splitter-...
https://www.amazon.com/ikuai-Charging-Aluminum-Splitter-Incl...
https://www.amazon.com/TP-LINK-UH720-7-Port-Smart-Charging/d... (USB 3.0)
https://www.amazon.com/Rosonway-Charging-Aluminum-Splitter-R...
Am I missing something or do all but one of those do exactly what you want?