I was thinking of the attachment point.
Quote:
Proper System Mounting
Mounting the parachute system on the rear of the vehicle is a critical part of the installation. In order to ensure that the parachute ‘sees’ the air flowing over the rear of the vehicle properly, it should be mounted 45 degrees from horizontal, and up and behind the spoiler.
This is a very important note; if the ‘chute is mounted under the spoiler, it won’t see the proper amount of air for deployment and could fail to open when you need it most. In addition, the ideal anchor point is centered on the car (left to right) and should be at the center of the mass of the rear of the car. Stroud recommends somewhere through the crankshaft or camshaft centerline on a door car.
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Five Things You Need To Know About Parachutes With Stroud Safety - Dragzine
It turns out they're pretty high maintenance.