I've just received by PXFMini and I intend connecting it to a PI Zero W. The issue is, I got myself a PI with a pre-soldered header and the pins are much shorter than those supplied with the PXF mini. As such, if I use the plastic spacers that come with the PCFMini, the pins don't connect.
To give an idea of how close they are, if I have a firm connection on the pins, there is only around a millimetre of space between the USB sockets on the PI and the PXF board above it. I can get little plastic spacers and make this all secure and nice but I'm concerned about airflow.
In short, if I use it like this, with so little space between the boards, will the PI overheat?