really u just pick up a raspberry pi and a memory card, and just follow the video above.
im using the pi400 (got a good deal on it and had a built in keyboard)
but u can go with any raspi 4 and add an SD card.
watch the video. it literally took me 15 minutes and had never used a rasPi before.
i used for duck dns for my DDNS since i didnt have a static IP.
my Duck DNS
not sure if you have ever worked with a RasPi before.. they are amazing devices. but def harder to set up. of course you are going to spend more money on an item like yours thats turnkey right out of the box.