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That's fine: +V is the same as +12, (i.e. +12 V) and GRD (or GND) is the same as common (i.e. ground).
You should connect them to the input side of things in order to keep the fan running at all times; if you had them on M+ and M-, respectively, the fan would work, but only when you applied power to the motors! (Don't do that!)
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