No, only VMware Fusion 5 Standard comes with a License cost for 3 personal Macs. VMware Fusion 5 Professional License cost is per Mac, meaning each Mac must have its own separate License.
Source? I think they're both unlimited, provided it's the same owner. From the Fusion 5 EULA, section 13:
VMWARE FUSION AND VMWARE FUSION PROFESSIONAL
You may install and use the Software for personal, non-commercial use on any Apple-branded products running Mac OS X (“Mac Computer”) that you own or control.
Commercial use is covered in the next paragraph, and I think boils down to 1 license per computer regardless of owner or concurrency.