Here's a tip for you if you ever plan to use it as an emergency spare for home.
Set the SSID and password to be the same as your home one.
This can cause issues if the home internet is running at the same time (my home office and the van on the drive were close enough that I'd sometimes get problems) but otherwise it means that you only need to make changes to the default set up on the Teltonika once, and you don't need to configure all your various home devices to connect to the Teltonika as they already have that SSID and password saved.
Mrs S was able to start a WiFi video call in the house and continue it seamlessly while getting into the van and carry on after we drove off. All very clever
I'm also a big fan of having a separate Guest network, but that's up to you really. Not difficult to set up.