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The first thing is that all scart cables are not necessarily equal. Some won't pass signals both ways. Make sure they are the full 21 pin types.
My preferred wiring with scart would be:
STB # 1 > TV in #1
STB #2 > DVD/VCR in #1
DVD/VCR out #2 > TV in #2
Tuning the video will be done using the AV channel settings rather than channels 1-6. channels 1-6 (or other numbers) are received via co-axial aerial, not scart. If you want you can daisy chain a co-axial aerial from teh RF out on the STB to the VCR and then to the TV as a duplication of the scart leads.