Best POWERED USB HUBS for iPad and iPhone - YouTube
Akai EIE Pro
Baseus Multi USB C HUB to HDMI USB 3.0 Type C HUB For iPad Pro Multiple Port USB C Type C USB HUB Adapter For MacBook Pro Air-in USB Hubs from Computer
M-Audio AIR|HUB - USB / USB-C Desktop Audio Interface with Built-In 3-Port Hub and Software Suite : Amazon.co.uk: Musical Instruments & DJ
Finally, Connect a USB Hub and Audio in One Gadget, on Laptop or iPad - CDM Create Digital Music