How close are the landing pads actually expected to be? You would think that >500m would be necessary to keep a safe navigation distance and prevent one RUD from taking out the second booster.
I did some rough approximation in Google Earth, the landing pads all appear to be about 1,000 feet from each other. The top yellow line matches to the top measurement box, the bottom yellow line matches the bottom measurement box. The red line is a copy of the top yellow one, rotated and aligned with the center of the south pad. As you can see, the north pad clears that red line by a little, confirming (in the loosest sense of the word) that all the pads are about 1,000 feet away from each other.