I purchased one of those OTG usb adapter/hubs that allows you to charge your tablet at the same time you utilize usb devices. I don't like the way it just hangs off the side. I created this holder so you can slip the cable into it.

I also printed out a stand for my 8 inch tablet and glued this holder to the back of it (https://www.thingiverse.com/thing:2897660).

OTG Adapter Here - https://www.walmart.com/ip/4-Port-Micro-USB-Host-OTG-Hub-Power-Adapter-Charging-Cable-for-Android-Phone-Tablet-PC/971642870