I will install my RUT955 in a "hostile" environment : mountain, less relays, poor data flow
I will connect a yagi antenna to the RUT955 and, as you said, I want to find the optimal orientation.
Analysis tools (such as LTEwatch,LTEinspecteur) allow the optimization of the reception. You see in real time RSRP,SINNR,RSRQ, noise ...
Have a look on these tools. They could be useful for everyone