A four port ethernet HUB is what you are looking for. I haven’t seen one that is three ports. Plug three cables in and you are off to the racers, no fuss no muss.

You could use a switch, but, it doesn’t make sense unless you add a third or more devices and those devices will interact with each other. A switch is intended to allow multiple data paths simultaneously whereas a hub is a shared link and only one device can “talk” at a time - but don’t worry about that, the devices themselves and your router will manage the traffic ie “conversations”