I'm assembling a Tarot X6 with some electronics (LED lights controller, LiDAR, Connex etc.) and I would make the work as clean as possible.
In order to safeguard the parts, I would mount the GPS antenna on the very top of the central chassis (upper carbon part) installing the 3DR Pixhawk on the lower section, where the PDB is.
I attach an image showing where I could place the FC.
Do you have any experience in placing the Pixhawk with a different orientation/position instead of the central one?