Are the LiveU Net 4G and LiveU Net 5G Compatible with Solo PRO?

Yes the LiveU Net 4G and LiveU Net 5G external modems are compatible with Solo PRO.

Due to specific power requirements of these external devices, when used with the Solo PRO Y-cables (for 4 modem support), both side of the Y cable should already be plugged into LiveU Net devices before plugging the Y cable into the unit.

Also, you cannot disconnect just 1 modem from the Y cable in order to unplug it and plug it back in, for example.  

This same need to always connect in a group is not true of other external devices, such as other external modems besides the LiveU Net family.