Mounting on the wall is cheap and easy if you have walls in approximately the right place.

Remember that QS's are more tolerant of placement than direct speakers -- mine aren't even at the same height or orientation but they sound mighty fine. If I did that with direct speakers it would sound quite odd.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8