Recommended for 21.5" iMac with Retina 4K Display (Mid 2017) by Apple - GTrusted
Help with imac 2017 connections | MacRumors Forums
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
iMac Pro (2017)でマルチディスプレイを利用する際の注意点。 | AAPL Ch.
Consomac : Un design presque inchangé pour l'iMac 2017 ?