Hi All,
I had the very same problem with the rear shorted springs, I also shared similar concerns that if you went over a bump or something the spring could become dislodged.
Tried a number of solutions but eventually ended up with this ( Ignore the Fiat top mounts I have welded on )
Similar to the straps idea but instead I drilled 3 holes in the top mount and at the bottom then secured the springs with Stainless Zip ties, in my testing thus far I have had no issues.
Cheers George