I would agree that having two coolers is probably overkill for your engine, Lee. And there's a weight penalty, not just from the cooler and plumbing, but also from the additional oil. I don't know much about the Mocal model, but the Carrera cooler is hard to beat, and it benefits (in bumper-to-bumper traffic) from a fan.
If you do plumb
two coolers, run them in series, and consider inverting the coolers to reduce hard to reach plumbing bottlenecks. I started with the crossover lines under the front spoiler, but have since had that switched to running through the trunk. Wouldn't want to tear one loose on a curb.