I currently use a Kobo Aura One 7.8" Nova Pro 7.8" and a Samsung Tab a 10.1" all with a 360 rotation case and having no problems using them on the sofa or on the bed. I'm also in the market for a 10" but the prices are over my budget, I also have a reading cushion which I use for physical books.
If Amazon or Kobo released a 10" device I would buy it in a heart beat.
Check Pic link
https://drive.google.com/drive/folde..._r?usp=sharing