1st, you never need to worry about something being able to handle "too much" current. So, the relay says it's a 40A relay, that means it can handle up to a 40A load.
2nd, if you are using the supplied DPDT switches, you do not need the relays.
3rd, yes, you are correct, it will take 2 relays per switch/pump in order to reverse polarity, but that's only needed when using a SPDT switch instead of a DPDT switch, like what comes with the Puppies.
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