I am pretty sure it won't matter which panel you put it on, it should bridge all of them. They are most likely all tied together. We know for sure that at least two of them are tied together. Even if they are tied together at the meter can, it should still work.
However, it may work better on the panel most central? I am not positive on this, it just seems logical to me. It seems to me that if we need to boost a signal in a large house, that it would loose some strenght at the end points of the runs.