Well, a dealer in Germany is offering both key cards and dongle bundled with the Speed Editor, so it should be possible.
But if you take good care of it (which would be the case for a dongle too), the key is the better option:
– You can activate it on two machines.
– You can use use both Fusion Studio and Resolve Studio in version 17.
– If your machine crashes, it doesn't get lost. The third activation will simply cancel the first, wherever in cyberspace it is.