Hey borbeso. Welcome to the forum.
How many feet of cable are you running in wall? Is the 16-20 foot run the entire run? And is that cable rated for in wall use?
I would be more concerned about signal degradation (attenuation) with the (potential) length of cable that you are running. Run the cable and connect. If there is degradation, you can purchase a booster, which helps for both multiple connections and long cable runs. Cheers.