In this article Genelec shows why M030 and M040 studio monitors can easily be placed with their back panel right against a wall.
If you would like to know more about studio monitor placement in a control room and possibile problems (e.g. "minimum phase low frequency boost") read my Resolution articles "Myths and facts about studio acoustics" (sweet spot - Resolution Magazine 2014 April-V13.3 and May/June-V13.4).