I did for 280SL LHD. Yes, they go very close to the floor (in your case routing is different, I understand). When they are hot, they go down and towards aft a bit, about 1cm, maybe even 1-2cm in the very tail - at least it is what I observed.
I think levelling of the drive train may play a role.
The fit is tight, but it worked perfect in my case - no touching, no noises.