Gigabit Ethernet Coupler Design
The importante part is that you must set the rule about matching. As your data is diferential lines you must pay attention to the matching of the lines, around 100mils. If you want a more precise information many manufacturers add the routing rules in the datasheet.

Also the impedance for physical lines is 100ohms in diferential as you have it.

Another factor you should take into account is the separation between lines. This information I don't remember but check the data sheet of the connector or coupler, I'm sure they have some info about this.

Hope this information is useful. Best regards.