I’ve never have used a local CORS for PP flight data, they are too far away (>20 km) too use to PP for flying, besides they only log static data. They closest ones do log at 1 sec but I only use the CORS for PP of the local base.
RTN is another matter as it computes a VRS position close by, usually <10 meters IF I have cell coverage. Otherwise I’ll use the local base to PP all flight data.
Short baselines are best