I checked all internet to find a DIY of mounting park sensors for tourer, but still couldn't find one, so I decided to buy sensors anyway and make my own DIY I hope it is the same as I have steering wheel on the left side
Scroll down for photos and further instructions.
First you have to remove all panels in the right side of the trunk and tailgate:
You will see GREEN and BLACK wire which goes to reverse light as in photo below:
Then you have to remove bumper and make holes in it:
There is a hole from outside to trunk trough a piece of plastik for wires:
Then you have to connect (+) wire from that box of parking sensors to green wire of revere light and (-) to other minuses:
After that just find where other wires goes from tailgate to trunk and just attach new one to those wires:
And that's it works just fine.. "almost" hit mom's BMW
I'm sorry for my English and I hope that this DIY will help anyone. If anyone has some problems installing it, please feel free to contact me.