All suspension bushing bolts on any car should be torqued with the car at normal ride height so the rubber bushings are under minimum strain in the position they will spend most of their life in.

It can sometimes be difficult to get a typical 150 lb-ft torque wrench on the fastener with the car on the ground. If so I tighten the fasterner as much as possible with a suitable combination or socket setup to what I think is near the final torque spec, then raise the car sufficiently to get the torque wrench in position to do the final torqueing.

Duke