what would it take to include Toyota Prius?
Gen3 alone (2010-15) is over a million cars.
Even my "low end" 2011 "two" is fully compatible. I am almost done installing dudu-360. 
360 App / HW Vehicle Images: Toyota Prius?
What's wrong with the installation?
There is no Toyota Prius in the 360 App list of available vehicles. MANY other Toyota models, just not Prius.