360 Jacking up 360

Need a bit of help here. I just purchased a 360 Spider, and I’m having the wheels re-finished. They just don’t mach up with the rest of the car as far as quality of finish. Also I’m cleaning everything I can while they’re away. I lifted the car with an aluminum racing jack, then blocked it up under the frame, then added a typical car jack under the jacking point that I originally lifted it with, as in the photo, just as an added measure of protection. I’m going to need to do this at the rear when I get the fronts back. My problem is I’m not exactly sure where, at the rear, I can put my blocks. I just can’t really see things as clearly as I could at the front. Could anyone recommend an appropriate spot where it’s safe to block? Thanks!
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