Here is a little tidbit for you:
An RS+ works under partially obstructed sky and gets a good fix over LoRa from an RS2 base nearby:
The skyview of the rover is a 66 degree clear swath overhead; a building is 1m to the south, 2m taller than the antenna; and another taller building is 9m to the northeast; and a small stand of trees to the north 18m away with tops 24m above the antenna.
I had all constellations enabled on the RS+ and chose Beidou instead Glonass in this case for lack of Glonass corrections. To be fair, I did not try with Glonass enabled.
The takeaway here is that RS+ works fine with RS2 as a base. RS+, using ReachView v2.18.0 is picking up this fix using corrections from GPS, Galileo, and Beidou.