Just worked it out.
If you get the files using NuGet (as we did), it dumps the template files into /Views/Shared.
To get them working, you need to create a new folder within /Views/Shared/ called "DisplayTemplates"
You then need to move the template files that have been dumped into /Views/Shared into /Views/Shared/DisplayTemplates/
Looks like a great solution but I really had to trawl around to find this out. I'll stick a blog post up about it.