Only a few areas with
tidal gauges seem to be far enough away from plate boundaries for it not to be a possible factor, e.g., northern Europe, eastern North America, central Pacific islands.
Not exact matches
Seems quite a bit easier to go with the
tidal gauge record; it has its complications, but at least you are starting with reasonably direct measurements of sea level.
Remarkably, it
seems that their main justification for applying the adjustments has been that they make their estimates better match the
tidal gauge estimates, even though the reason why the satellite measurements were being carried out was because the
tidal gauge estimates were unreliable!