the thing I like most about it is that you’ll never need to prove that I+I=II. It literally is II.
I hated discrete structures class in college. Nearly half the class dropped out, me included. Not because I was failing. I just couldn't give a damn. 1+1=2 is true for the same reason I+I=II is true. That's the whole concept of 2.
For Unifi devices you setup a Virtual Network then assign the guests to that. https://help.ui.com/hc/en-us/articles/115000166827-UniFi-Hotspot-Portal-and-Guest-WiFi