Install went very well last night! At least for the kouki BRZ bumper, they actually match the lines of the bumper super well. These went on without any forced conforming/"bending" to the bumper. They match up nicely with the lines the bumper has, and the "rear" of the canards can be somewhat pointed and stuck on with their 3m tape in whatever direction you want. So my friend and I angled them toward the lower corner of the sidemarkers.
So yes, they do indeed work on 2017+ BRZ's at least. Hope this was helpful!
A couple quickie pictures from this morning:
