If one of your rooks has penetrated onto the opponent's pawn-rank and there are no obstacles in the rook's line-of-fire, then if you have another rook you should always aim to double the firepower.
The best squares for the knight are, basically those in the central zone of the board - d5 and e5 (d4 and e4 for Black). Hans Kmoch, Pawn Power In Chess
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