Probably too unsightly for many, but I use gooseneck arms from snakeclamp.com. I use them for many things, like making helping hands for soldering, bike maintenance, and mounting monitors. You need to get one rated for the intended load. There are a ton of mounting base options and plenty of attachments, including one for holding tablets.

Sounds like it’d not be you ideal solution but thought I’d mention it on behalf of others.