[jcrawfordor]

If you're looking for a relatively low-cost option for "always correct" wall clocks, Primex radio clocks are popular enough that they are very cheap used on eBay, and if you live in a city there is a decent chance there is a GPS-disciplined Primex transmitter within receiving range (hospitals, schools commonly have them, you can check with an SDR). Or for a standalone solution, the sadly discontinued Primex SNS series of digital and analog wall clocks are just WiFi NTP clients. Supply is becoming limited since they were discontinued but they still run fairly cheap used. Initial setup (WiFi credentials, NTP server, etc) is slightly eccentric but can be done with tools available online.

The analog wall clocks are battery powered and with the default config of re-sync every 3 days, the batteries last years.