Smallest tablet to start for dashboard web app?

Aloha community, I would like to start a web app. The smallest device would be an 11 Zoll Tablet to desktop. Smartphone device wouldn’t be make any sense for dashboard in this app. What frame I have to choose? I saw something like 1280x800 10.5 Zoll this would be working on my own tablet, I have Galaxy Tab S9 I’m not sure, but it is 10.9–11 Zoll 2560x1600, but it is obligatory the 1280x800 10.5 Zoll? . What frame I have to use to start with the smallest tablet?