HMC988 quad driven by HMC987

Hello, I need to drive a 4 GHz clock from one HMC987 to four HMC988 running in parallel.  Each HMC988 then outputs a 1 GHz clock signal.

Question: How can I trigger the four HMC988 to be phase aligned?

Also, how should I write to the SPI buses from a laptop, is there some kind of adapter?

Thanks very much,

John Reyland