Two pumps will work, but...
keep in mind that this pump (like all other pumps) have a maximum head, i.e. a maximum pressure that they can take: if both pumps are running together, they will not exceed that maximum pressure.
The benefit of using two pumps is that a higher flow rate will be achieved, but it's not as simple as 2+2=4: the flow rate may not double.
Another advantage is that if one pump fails, the other will still work, and keep things going. It would be interesting to setup something to detect a "dead pump" condition (AC wired LED???).
I've thought this trough this past weekend, and I can't think of a way to setup the pumps so that the flow is actually doubled (check valve?). Even in series (pump after pump), the benefit would be marginal, simply because the pump is not designed to run as a booster pump.
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