Securing Shelly devices

Hey guys, just got my first Shelly, but do not yet have a RP or Mosquito MQTT broadcaster, what's the best way to secure this connection for the time being?

Currently have Shelly cloud disabled and using user/pass.
Also blocked "" via Asus FW blacklist.

My router is also not Vlan capable (RT-AC1900P with stock firmware for mesh support).

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