Sorry it is 350 - 420mm, I was using the phone and just recalled what I thought were the heights.
Two issues a) it is the drop plate actually fitted to the towbar that the vehicle manufacturers have to obtain type approval for there use. I doubt IA will have type approval because of b)
b) the holes in the tow bar are not aligned to the standard drop plate holes, only the bottom 2 are M16 holes and spacing the other 4 are smaller and closer together.
I had identified it as an issue because I have a number of trailers and horse trailer. My plan was wait until I get my hands on the vehicle first. It is not a showstopper and IA will be fully aware of the EU regulations. It may be when coupled the vehicle settles to an acceptable height.