Two taco pumps, in line or parallel?

So after sizing my home for 100k btu Dunkirk boiler, my wholesaler sent me 2 taco 007 circulators to install on my system (along with all of the other necessities) I am wondering if I should put these circulators in line with one another or parallel, I have read benefits/drawbacks about both ways….my new system has a watts manifold with 7 individual loops totally almost 600 feet of 3/4 pex piping overall. This is my first post ever on here, if anyone has any direction please let me know.
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