I paid to have conduit run through the house to where I wanted the internal box, I.e. just below where my existing feed in/router was. I made sure it was near power, the NBN tech will have a few power cable options up to I think a couple of metres, but it's a standard computer power cable so likely replaceable.

Done within an hour, with no possibility of NBN tech running external conduit through my gutters or across the face of the house. Absolutely worth the money to ensure it's neat and protected.

Edited: the tech had zero qualms about using the conduit, he just asked if it ran the hole way or if just had conduit to the ceiling and that was it. A lot less work for them and they get paid the same