Using the top/middle/bottom 8 as the model, in 5 last seasons, 47% of relegated sides finish top 8, 33% middle 8 and 20% bottom 8.
Each season at least 1, normally 2 of the relegated sides finish in the top 6.
The last 2 seasons have been very rare when none of the 6 relegated sides have been promoted back to the PL.
Personally, my expectation is a minimum of a top 6 finish. We are 3rd / 4th favourites with the bookies for a good reason.