If table is prepared before, then you may (reasonably) temporarily move items to setup your system.
But as the opponent team may request objets changes after you are prepared and because nothing prevent the referee from doing so, you should not count on the fact that the table is installed.
For instance do not take a picture with the robot during your preparation sequence. If you want something similar, then take picture periodically every 5s, and then use the last treated one when start cord is unpluged.