Amazon's Echo Spot has a hidden USB port concealed behind a removable panel | AFTVnews
Amazon.com: OTG Cable to Ethernet Adapter for Alexa TV Cube, TV Stick Lite 2020, Show (2nd Gen), Micro USB HUB with Power : Electronics
Amazon.com: Belkertech Ethernet Adapter, USB Network Adapter/Micro USB to Rj45 Ethernet Adapter, USB to Rj45 Cable for Fire TV Stick, All-New Fire TV, Chromecast Ultra Audio Etc : Electronics
Echo Link Amp Hardware Guide - Amazon Customer Service