This has been raised several times Aldby, but no answer to date. The low rear A frame and carrier mounts on the eZee bikes rules it out in the correct position.
There's an alternative type which can be fitted that's on
this link, but it doesn't help with the one you've got of course.
However, you can fit it on the rear of the front fork, and that would bring the key to the correct side for the UK, though the clips might need slight modification. That would add still more weight to the front of course, which might be undesirable.
Fisher do a spare standard
mounting kit if you need one.
.