rainlei
I've been using johnstech socket for years, but at lower freq (< 3 GHz)
Consider that normally we had to design new boards layouts when applying the ICs directly on boards.
They aren't cheap at all: 1 socket is about 8/10 k$, 2 12/15 k$ and so on.
They want you to send them some packaged samples before starting the design and they take some month.
I know that they have higher freq. series but I don't know them.
We usually use low freq. socket to verify functional samples and then solder on boards to final char.
In your case, as you need to verify process spread, I think you have the VCO tank fully integrated, so maybe also a lower freq. socket could be ok. But with ground and supply... ?!
My opinion is that, in this case, maybe solder samples on boards is cheaper and more safe.
Mazz