Following my previous post, I ordered a couple of display with the goal to show the EX‑CommandStation IP address and port. Connecting the display was very easy and by default the IP and port are shown on one of the pages.
I tried to connect to different Wifi: EXT-5G and 5G, but it failed and showed an IP of 192.168.4.1, that is the default one for the Point Access mode, whereas I want the Station Mode that connects to my home wifi.
After discussing on Discord, the Wifi shield only works with 2.4Ghz wifi and it seems that my default Fios was too far for the shield to connect. But, I managed to make it with on the Wifi extender.
On JMRI, the connection is DCC++ Ethernet and I just needed to input the IP adress.