Multi aerial box?

3 outlet multi box in attic feeding TV's via wall sockets in our bungalow.
Q:
Can I use a twin outlet plug, plugged into one of the M-box outlets to run two TV's without signal interferance between both TV's. I'll be using digital top boxes on both TV's. I don't want to cut holes in the ceiling then find out it won't work, plus it's B....cold up there and don't want to freeze for nothing.