Sound advice from the ever-wise Adam.
I would recommend using a stacked plate cooler. B&M makes a nice stacked plate unit (Supercooler).
I have mine on the driver side front - in front of the condensor. It is mounted lengthwise and seems to get plenty of air flow (plus it is mounted close to the condensor, so the fan should be able to pull some air through it while stationary).
I get air through the bottom rad opening and the opening where the hood latch is (better than the fog light IMHO). I was going to make an alum air dam/chin spoiler, but have not had to yet.
the top radiator heat exchanger line should be the output from the heat exchanger, if you want to have the aux cooler in series after the heat exchanger (fluid goes to the radiator exchanger, to the aux cooler, and then back to the trans). If you search, note that IIRC AOD's have their lines backwards. Be sure to check yourself before installing the cooler.
It looks like you could dope mount the cooler in the driver fender area (below the horns) if you had to. You would have to rig up some gutter flashing, etc to direct air to and through the coil though.
My random thoughts. good luck.
