Addendum:
Until 11.7.2019 you can get a CadMouse Wireless + Mouse Pad for free directly from 3Dconnexion. More info here: https://www.3dconnexion.de/spacemouse...

First result in Google below the ads: https://www.3dconnexion.de/supported-...
Pretty sure it took less time than writing the question... ¯\_(ツ)_/¯

But I would seriously reconsider whether it really has to be the Enterprise. It's only worth it if you use the function keys intensively. Today I would rather go for the Pro Wireless: 3Dconnexion SPACEMOUSE PRO WIRELESS
But you have to decide for yourself.