I've had a look at some of the seasons where the points tally of the top 4/6 have been at their highest.
The second best was in 2013/14 when Wolves and Brentford both finished in the top 7. The fourth best was in 2018/19 when Barnsley went down and Luton and Charlton finished 19th and 21st respectively.
The lowest points tally of the top 6 saw Colchester finish top half and Southend relegated.
I don't buy too much into how many points they won.