as far as i know, the key problem with entanglement signal transmission is synchronisation.

the difference in the gravity between two points in space alters their relative speed of time flow. you can't get a signal across if you aren't tuned to the right channel.

however, physically fixed endpoints will be able to get tuned well enough, since the gravity fluctuation is comparatively lower in any place with a device sitting still in one spot on a planet, whose motion is relatively stable.

i think the even bigger challenge is that you have to physically transport the device first before you can use the connection.

as in, no matter which way you slice it, there has to be pairs of devices made in one place, and one sent to the other location in order to make the connection. however, since you can then use cabled and radio connections on the other end since latency is low enough, launching a long range network can be done in stages, and capacity can be incrementally increased.