Yes, you can use a Galaxus multi-SIM with the ZTE MU5001 5G MiFi router. Here are some important points that confirm that the device supports SIM cards:

- The ZTE MU5001 is simlock-free, which means it is compatible with different SIM cards from different suppliers.
- The device supports various 5G and LTE bands, which ensures broad compatibility with different networks.

It is therefore possible to use a Galaxus multi-SIM in this router as long as the SIM card fulfils the supported frequencies and network standards of the ZTE MU5001.