No prob.
Option one: pumps in series, it'll work, and the second pump will act, like I said, as a booster pump. In terms of pressure, the booster pump increases the pressure above the input pressure, as it would normally if it was running as a single pump. The limitation is that the resulting pressure on the second pump's housing is more than normal, so you have to watch out for leaks. For these 2 pumps though, it should be ok.
In case of failure however, the dead pump will restrict flow a lot, so it's not so good.
Option 2: pumps in parallel, you'll be limited to a MAXIMUM flow rate that is somewhere between the MAXIMUM of the two pumps, but you'll have a better head, which translates in better flow. Not as much as option #1 though.
In case of failure, the dead pump does nothing. In the worst of cases, the pressure from the first pump will leak in the dead pump, resulting in a lower flow than what the working pump can provide. This is fixed with a flapper valve. (don't ask me where to get one!)
Just as a thought, your idea is good, but I don't think that you should worry about pump failure. These things are fairly reliable.
You do need however, a plan to handle failure. The first thing to do is install MBM, unless your mobo has OCP.
If you're worried about pump failure, then I have to assume that there are a number of other items that you also worry about. If you think about it though, it all comes down to the CPU overheating, which MBM or OCP can cover (unless your waterblock falls off, in which case only OCP can cover ya).
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