I have heard of people running without reinforcement and it being okay. That said before upgrading to my current MCS suspension I talked to some well known race shops. All told me not to run a coilover rear without reinforcement so I stuck with the divorced spring/damper set up in the rear.
Looking at the front shock towers and the rear shock towers they are both just thin sheet metal though so I am don't know why you can run a coilover in the front but not the rear. Maybe the front tower sheet metal is thicker and designed to take the load vs the rear not being?
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07 Z4 M Coupe AW/IR
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