I added a message about using this POE to ONT device (which powers the ONT) to a thread previously, kind of interesting and useful, I got a thinking, as I have a small UPS which holds my UDM-SE up when I pull the power, that it would also hold up my fibre connection, which means my WIFI and other devices could/would stay connected to the internet. So that’s definitely a positive reason to go buy one 
So thought I might add it for others to have similar thoughts
As a side note - dont forget though as your fibre connection runs though this box - that it CAN be a speed restrictor as well, so if you buy one, be sure it supports higher speeds than you expect to get from Yayzi.
