pcie x1 slot ✓ Does PCIe x1 mean a standard height and full length?

You can use a PCIe x1 card, or a PCIe x4 card in a PCIe x16 slot They work fine So if you think you are short of PCI-e slots, you may not be pcie x1 slot,You have no extra pcie slot for the wifi adapter ITX boards usually only have one 16x slot and no extra 1x or 4x

According to this tweet, 52Pi has built a PCIe x1 open-ended slot HAT for Pi 5, which allows switching between internal power (leeched off pcie x1 slot,PCI-E X16 Slots can run in x1, x4 , x8 and x16 modes so you can install a x1 card in a x16 slot without worries of shorting anything as long as

pcie x1 slot,You have no extra pcie slot for the wifi adapter ITX boards usually only have one 16x slot and no extra 1x or 4x