I had a custom variant of that can made by forge as i was the trial LCR they tried to fit it on
Have a look in my RR at the pics, it will be mounted off rear airbox bracket
As said aircon gassing point fouls this but i seriously reckon bracketry to support it 40mm lower could be easily made. I have even offered to do it just to prove it
Do you have any pics of the tank fitted??