I couldn't get my SMC tank to fit in the same place after the dual fan install. I mounted the tank right in the center between the 2 fans, above the IC, right next to the up-pipe. I had to fab up some brackets for this, but I also used the brackets in conjunction with mounting the fan. In short, I have an aluminum angle bar mounted between the 2 bolts in the core support that once held the stock fan. I also have a bar running along the bottom of the fan that I used to mount the lower factory fan mount. I simply drilled a hole in each bar and placed another between the 2 with bends to clear the fan. The tank is mounted to this bar. It hangs free just as it did on the factory shroud.
I like it better there also because I once saw the alcohol bubbling from the heat last year. Now it has more moving air and is away from the turbo.