Thresholding with small volume correction and two ROIs

Dear all,
I am thinking of doing a group analysis with small volume correction in fsl-FEAT by setting a pre-threshold masking in the Post-Stats tab, together with the Threshold Free Cluster Enhancement (TFCE) option.

I want to do it on two separate ROIs: the amygdala and the mPFC, and I want to correct the threshold because of that (as recommended here:

My question is: what p-value am I supposed to correct? how can I take into account the fact I am using two ROIs, when in fact I am doing each group analysis with a separate FEAT template?

Thank you

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