You're about 12-18" too far back. The subframe mount is right by the port into which you insert the lifting arm of the change-a-flat jack. The salt shaker thing is a flat flange with three stright edges and a rounded remaining edge. Two bolts on the front edge, one big bolt up the middle of the round part.

The car will sit higher after you unload the springs. It'll settle after you drive it.

Sixto
91 300SE
87 300SDL
83 300SD