Either way will work but it makes the most sense to wire in parallel. Rear speakers are small and won't demand much power that you will have a stability problem at two ohms.
I've got 4 2.75" speakers in the rear, in parallel, driven directly with a cheepo JVC BT head unit. No problem.
Now that I think about it, Last year I added the door speakers to the rear channels as well ( in parallel). No issues.
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