What is the max number of USB 3.0 ports you can have on a single USB hub? - Quora https://www.quora.com/What-is-the-max-number-of-USB-3-0-ports-you-can-have-on-a-single-USB-hub
ふーむ?
今はこれ使ってる
Anker 7-Port USB 3.0 Data Hub with 36W Power Adapter and BC 1.2 Charging Port for iPhone 7/6s Plus, iPad Air 2, Galaxy S Series, Note Series, Mac, PC, USB Flash Drives and More https://www.amazon.com/dp/B014ZQ07NE/ref=cm_sw_r_awdo_navT_a_7BBM8NDTZ8TWTDY2CX5P
支店あるっぽい? そっちでも良さそう
https://www.hotpepper.jp/mesitsu/entry/kekkojin/2020-00232
キーボード/Dvorak/SKKが好き。アメリカに住んでる。