Technically, it's something you shouldn't worry about...until you have to worry about it when you start getting noise/crud, so it's probably best to deal with it now. My suggestion, however, would be to move the P/S next to the Pam's; since that outputs clocking/trigger signals, P/S garbage won't be problematic for it, and the Arturia P/S should be just as happy on the bottom row as the top. In fact, the cable-draping for the P/S's line from the external "wart" will work even better down there, minimizing its proximity to the rig altogether.