QNAP has a list of what is supported for each model. It will fit if the TS-253-B has an M2 slot that supports the 2280 length (8cm).
However, I do not see an M2 slot in the NAS mentioned. Possibly via plug-in card, of course.

According to the technical data, however, you have to "sacrifice" the PCIe slot for an M.2 PCIe adapter. And since the SN7000 does not have a SATA but a PCIe interface, it could work.

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