I am on Singtel 10Gbps Enhanced Plan with a bridged Singtel ZTE F8648P ONR, so I don’t have a double NAT problem.
For my UniFi setup, I have two limitations. I don’t have space for a server rack and can’t ceiling mount my Access Points (APs).

I am on Singtel 10Gbps Enhanced Plan with a bridged Singtel ZTE F8648P ONR, so I don’t have a double NAT problem.
For my UniFi setup, I have two limitations. I don’t have space for a server rack and can’t ceiling mount my Access Points (APs).
Why?
I was using the Asus ZenWiFi BQ16 Mesh Router since November 2024. After the initial trial and error of various settings to make it stable due to its buggy firmware, it was stable for over 6 months, including surviving a power shutdown.
However, things changed one weekend in July 2025. I woke up and noticed none of my home automation is running. To my surprise, all the wireless networks in my home are gone. First, I plugged my Ethernet cable into the BQ16 to determine why. To my horror, I did not get an IP from DHCP. Tried a couple of restarts of the BQ16, but the issue remains.