Is there a critical span where one should place real-time monitors?
Generally, the answer is no if thermal limits are intended to limit sag and yes if intended to limit cumulative loss-of-strength. If sag in a certain section of line consistently determines the thermal limit, then the sag clearance in that section should be increased by conventional mechanical upgrade methods. If the conductor runs consistently hotter in a section of line, then monitors should be placed in that section to avoid excessive loss of strength, there is little that can be done to expose the critical section to higher winds.
