Here are some screenshots that may help. Here is my “home configuration”. I have Remote Access LAN enabled as well, but that is not necessary.
Here is my travel router setup:
Notice how I have the config updated to my internal/Zerotier IP address for my home router, and not a public IP address.
Lastly, here is the route I added to Zerotier:
If you can follow these instructions and screenshots, this should get you where you want to go! Happy nomading!