The only two examples I can thing of are not Arduino and not prototypes (these are production units) but the Wi-Fi module for Garo EV chargers is a Raspberry Pi with an angled GPIO header.[0]
Also, the Wi-Fi module for Ebeco floor heating thermostats is a custom PCB with a SMD mounted ESP32 board. They never show that side of the PCB in the photos online but I have one and that's what it is.[1]
Also, the Wi-Fi module for Ebeco floor heating thermostats is a custom PCB with a SMD mounted ESP32 board. They never show that side of the PCB in the photos online but I have one and that's what it is.[1]
[0]: https://www.garo.se/sv/proffs/produkter/e-mobility/tillbehor...
[1]: https://www.ebeco.com/products/accessories/eb-connect-wifi