Mohsar

Two questions about setting up Salvage Run. 1) What counts as placing the station in the center of the table? Does the station need to touch the center of the table or does the second player need to attempt to line up the station's center with the table center? 2) When placing obstacles, do they follow normal restrictions in addition to needing to be placed within 1-5 of the station? (i.e. they can't be within 1 of another obstacle and they can't be 1-3 of a player edge)?