How to run two strips in parallel

venicenerd:
Copy that! How about the rest of the setup? Does it look correct?

Yes, OK. The two ground wires with the red arrows do not need to be heavy gauge, they can be thin but they should run close to the data wire.

Also, a large cap, e.g. 1000uF, close the power connections to each strip. Or 470uF at each end of each strip maybe.