I feel like this is an over sight on FFGs part, but Salvage Run says to place obstacles AT range 1-5 of the station. This super-cedes the RRG correct? So I can place any obstacles touching the station because it's at Range 1.
It's also the only objective that changes obstacle placement, but does not specify obstacles to be placed beyond a range of other obstacles. I would guess the obstacles still need to be beyond 1 of each other, but at 1 of the station.