A system only needs one clock source for the other units to sync to, so if your planned system has a reliable clock source then the rest of the instruments can sync to it.
There are many reports about the poor reliability of syncing Ableton Live as slave to another source - people say that it works better as the master. You might end up syncing the Elektrons to Live rather than Live to the Elektrons. Many people already do this before Overbridge has been released.