For those looking for another network jack, do NOT buy a Ethernet splitter. Buy a mini switch for just a few dollars more. The splitters have nice drawings that show how they work! But they don’t! The only case they would work is if the existing jack is wired for such purpose, in the case of older networks where it could work, it would make the whole network slower.
Had a good laugh yesterday when customer requested a splitter, even sending an Amazon photo. All the network people huddled and asked what would happen. Because all our networks are all Poe, it would be dangerous! Very likely causing damage to anything plugged into it..
Also there are mini hubs and mini switches. Hubs are slower basically acting like an old scanner moving data from one port, then the next. Would recommend a Switch any day!
Just passing on info.