Don't try to connect multiple speakers to the same run, as mentioned above it will change the impedance seen by your receiver.
Correct it will change the impedance seen by your receiver....or will it......
This is the part most often misinterpreted...
Consider this: It's your garage. You are using an old stereo receiver from the 70's or 80's, even 90's. You have 4 speakers to hook up. The receiver has 4 pair of speaker terminals. It has an AB switch for the speakers. But it only has 2 amplifiers inside.
You hook your 8 ohm front speaker pair to A and your rear pair to B. You set the speaker selector to A+B. The internal amp sees 4 ohms. You worked so hard to run 4 cables only to have the speaker selector switch parallel them up anyway.
Here is the back panel from an Onkyo TX-2500, one of the best receivers I owned. Look carefully at the words under the speaker terminals. TOTAL IMP: MORE THAN 4 OHMS. The internal amp sees those speakers in parallel just as if you did that on the speaker cables in the garage. The nomenclature on this panel warns you not to load either the L or R channel below 4 OHMS.
If you want to always run all 4 speakers, and have no intention of selecting between A and B, you can safely put a 4 OHM load on L & R with a single left and single right connection.
I once had a receiver where the speaker selector put A and B in series. So if you had only a single pair of speakers connected to A, and you set the selector to A+B, you got no sound.
FWIW, every speaker in my house has a home run of 12ga CL2 rated speaker wire.