Using a PCIe x1 card in a PCIe x16 slot

QNAP TS-1264eU-RP-8G , 12-Bay, Intel CPU, 8GB RAM, PCIe Slot, Redundant Power, 2U short-depth Rackmount · Intel® Celeron® quad-core CPU, redundant power

even with some custom mount3D printed thing so they don't electrically short out) since they don't need external cable access and their

short pcie slot I use Z370 Taichi motherboard in a server I have a WiFi card QWA-AC2600, which has short PCIe x1 interface

dark168 slot A Gigabyte motherboard showing PCIe slots Also, a shorter x1 or x4 card can physically fit