I was confused about oil cooler mounting position, as I found this info on the internet!
so I contacted Mishimoto support in order to cut it short, and they replied:
I was still confused, so I asked again apart from the upside down which position is better!
And here is the last reply
The upside down is the best choice for my Rocco because the front space behind the bumper is very tight, but I have to be convinced to mount it like that.