Rear facing car seats in boot for 2006 5 or 3

Is there an option for rear facing child seats in the boot in either the 2006 5 Series or 2006 3 Series? In the same fashion as available in the
Merc E Class.
If not available as an official BMW option ... maybe someone is aware of a dealer fit, or specialist 3rd party product?
Cheers, Paul Tinker
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