The QNAP TS-462T3 has a PCIe slot for 10GbE or M.2 expansion

One PCIe Gen 3 x2 slot gives this 4-bay NAS real expandability. Add a 10GbE network card, a QM2 M.2 card, or a USB 3.2 Gen 2 card. It also supports USB 3.2 external storage. Not bad for a compact unit.