I think the advantage of the second pump would be related to volume so I would assume the additional pump should be installed in parallel and not in series. To connect this way you'll need two tees, installed at the input and output of the current pump. The branch from each tee will connect to the new pump.
Booster pumps increase pressure but they also decrease volume (flow). Adding a second pump in series will increase the pressure but further decrease the flow rate and I can't imagine someone recommending increasing performance by increasing pressure without knowing exactly what pressure you're already running at, doesn't make sense so it must be an increase in volume you're looking for.
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