Seriously, forget Rosewall. He's like 5'7" tall and coming from the old school.
Modern servers don't just charge into net position on every serve. Most stay back after serving, especially second serves. If you choose to stay back, AND use Rosewall's idea of toss well inside your baseline, you will be caught in NML almost every time.
Now if you plan to attack the net behind every serve, his idea is correct, but old school.
Some people seem to think, with the modern equipement and practice ideas, that the returner can take a full swing at the ball on every service return, which means you can't always charge the net on every serve, every time.
And remember, it doesn't matter which foot you land on, what matters is how hard your serve is, how well it's placed, and how effective it is to win points. The point thing is most important. McEnroe and Edberg never served hard, but won lots of points.