joeyboygolf:
You do need the 140 wall brackets which are different to the 45/60 brackets and as Chris says are difficult to find these days.
If you want to rotate them here and there, yes - but if fixed perpendicular to the wall is OK, there are other solutions. For a pair of RL6000s, I got two perforated T-shaped steel plates (normally used for reinforcing wood constructs) from a hardware store. A pair of the holes accepted two bolts to the speaker rear mount directly, and the rest was only two hooks on the wall...
And the RL140/7000 aren't that heavy, only 15 kg a piece. An MX4000 with a wall stand weighs much more, and think of the wall mount shelves people have loaded with books...