Excuse me for coming late to this, but you're getting your marshal post locations confused. As I have marshalled at 8 & 9 for the last few years (bar 2020) we've known for a while that we are just before the fastest area of the track, the cars being a blur at 9 as they pass.
Permit me to explain .
8 is at the crematorium
9 in front of the Audi dealership
10 nowhere memorable
11 deep into the braking zone for the first chicane.
google maps satellite view shows white lines on the hard shoulder at each location.
using streetview also shows the number
https://www.google.co.uk/maps/@47.94...i8192?hl=en-GB