No, this splitter does not work as you imagine. To use it, you need at least two of them. In addition, you can only use the network with a maximum of 100MB and not up to 1,000MB.
The blue one on the following picture is the splitter
https://images-na.ssl-images-amazon.com/images...
Without being able to continue the situation, you need a switch with the appropriate number of ports you need.
https://www.digitec.ch/de...