If the fan or hat is installed on the Raspberry Pi 5, it is hard to install the bridge motherboard
a customer said "If the official fan or hat is installed on the Raspberry Pi 5, protrusions will appear on the back panel, making it difficult to install the Raspberry Pi and the bridge motherboard. "
When we designed this adapter board, we only made it compatible with the bare board of Raspberry Pi 5. If other accessories are installed on the Raspberry Pi, making it no longer compatible, then you can not use this adapter board and directly use wires for connection.