The Razer Archtech Pro is compatible with the Samsung Galaxy Note 20 and Note 20 Ultra. The company claims that the Archtech Pro not only protects the two new flagships against drops, but also that it offers enough passive cooling to improve performance.
https://www.notebookcheck.net/Razer-Arctech-Pro-A-case-to-keep-your-Galaxy-Note-20-or-Note-20-Ultra-cool.484323.0.html
If only something like this were to include a c-3.5mm splitter, but of course we can't count on Razer, who removed the jack earlier than Samsung.