Review on 🎩 POE HAT (B) for Raspberry Pi 4B/3B+: Power Over Ethernet HAT with 0.91" OLED Display – Supports 802.3af PoE Network. Requires 802.3af Power-Sourcing Equipment by Jay Hill

This product worked as described - the thickness was just right when you had to push and pull the board when attaching and detaching it from the Pi. The Heat Poe hat didn't get very hot when turned on and ran non-stop for a few days. Transparency I'm not 100% sure what you mean, but the POe hat sits nicely on the Pi and integrates nicely. My only problem was Po didn't work out of the box. Po has a specific purpose, and having to program it to do what it was designed to do was a little annoying.