You can use any basic LOC and tap into the factory wires leading to the rear door speakers (or front, whichever you prefer.
Unless you are talking about some expensive LOC/ factory harness combination, I don't see how 2016/2017 would be incompatible. Where did you get that information?
Adding subs doesnt require any special OEM integration module, as may be needed if replacing the factory head unit. (To retain door chimes etc. in that case)
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