Synchronize two/three/four LimeSDR-XTRX

I need to start several LimeSDR-XTRX devices to receive or transmit synchronously. Unfortunately, I haven’t found a clear instruction on how to do it.

I am writing my code in C++ on Linux. I need several devices to start receiving (or transmitting) a signal coherently.

Can you please describe the idea of ​​how to do this?