Well, when you buy stuff meant for the British and European market, you often run into incompatibilities. But in this case, the below installation diagrams look to me that they install just like our toilets. Don't know if this pdf covers your model specifically. And I didn't see a rough-in dimension, so that may or may not be an issue.
As always, I recommend you go to the design studio who sold you this and rely on them for techincal support.