It won't make a difference if carpet is there or not, because you'll have it tight enough the carpet will just be squished under it. If it was me, I'd cut holes in the carpet for it just because.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15