The TP-Link Archer TXE75E is a WiFi 6E PCIe adapter, but it is not compatible with a QNAP NAS TS-264 as a WiFi card.

Here are some reasons why this is not possible:
- The Archer TXE75E is a PCIe adapter specifically designed for use in PCs with a PCIe slot, not for NAS devices.
- QNAP NAS devices such as the TS-264 usually do not have PCIe slots or other interfaces that would allow the use of such an adapter.
- The installation and configuration of the adapter also requires specific software and drivers that are not available for NAS systems.

If you want to add WiFi functions to your QNAP NAS, you should look for special WiFi adapters or expansion cards developed by QNAP or other manufacturers for NAS devices.