Macs that are based on x86 architecture can be erased with Tabernus Enterprise Erase Software.
If the Mac computers are based on PowerPC architecture (for example G-series models), then booting the Tabernus EE Software Client software is not possible.
The hard drives can be erased by removing them and plugging them to a x86 based hardware and starting the Tabernus EE Software there.
Note that Apple computers do not, in most cases, support the PXE/network boot method. The easiest way to erase an x86 based Apple computer is to boot them from a CD or USB.
Tabernus has just updated our Kernel for being compatible with more MAC systems, this is a new feature and we are just going through our methods of validation/testing.