[gorlilla]

There are RTL-SDR [0] dongles that have pin headers for a common clock source already on the market.

[0]: https://www.rtl-sdr.com/rtl-sdr-blog-v-3-dongles-user-guide/...

[eskaytwo]

There’s also the Kraken project https://www.krakenrf.com/

[ooterness]

Neat! I hadn't heard about that capability. That definitely makes things a lot easier.