You get servos at pins 2-17 with that number entered. I've been playing around with it and it seems positions 00 and 01 don't work properly. They are assigned to TX and RX on the mega and that might be why. Also pins 20 and 21 are assigned to SDA and SCL and don't work either. So that currently leaves me with 17 working servos. Should be good.
I plan to feed the serial data to the board using a usb cable to a Rasp Pi and node red's dashboard to feed the serial inputs.
I am currently running my robot project using firmata on the mega to communicate with the Pi, but I'm not entirely satisfied with that, as when you run firmat a , you can't run any other code on the Arduino. That's limiting. I have found that ping sensors work fantastic on the Arduino, very accurate and reliable, but no so good on the Rasp Pi. So, now I can run code on the Arduino again.