https://www.elecom.co.jp/products/TB-A21SPVCR.html
左側以外ガラ空きなのが許容出来るなら
https://www.elecom.co.jp/series/slate-pc/ipad2021_84_case/tb-a21spvcr/image/img_visual.jpg
https://www.elecom.co.jp/series/slate-pc/ipad2021_84_case/tb-a21spvcr/image/img_002.jpg
https://www.elecom.co.jp/series/slate-pc/ipad2021_84_case/tb-a21spvcr/image/img_003.jpg