Mutual Inductance between two toroids Coils?

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I need to place two RF current transformers on the PCB.
I wonder how far they have to be apart so that they don't interfere with each other

More practically.
From PCB to short coaxial any as RG316 passing through first toroid T37 or T50, any spacer ring from Teflon, second toroid T37 or T50 and back to PCB, frequency under 20MHz, current under 3A .
How long the spacer ring must be.....
 

if the RF current xfmrs are toroidal with complete windings all round the toroid - then there is very little external field and the CT's can be placed one width ( of the toroid ) apart.
 

In addition, the setup described in post #1 isn't really clear. If there's a "coaxial…passing through first toroid...second toroid", it will provide considerable coupling, the core distance will be probably irrelevant. Just out of curiosity, what's the purpose of this configuration?
 

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