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This is how I mounted my three, 23"inch computer monitors onto my wall. Using only some simple brackets and a piece of timber.

Step 1: Attaching the Backing Plates to the Monitors

Attach the backing plate to each monitor using either the 75 x 75 or 100 x 100 holes.

Step 2: Placing the Brackets

Due to the weight of the three monitors and the mounts, it is advisable that they be screwed into the studs.
In Australia our studs are 600mm apart, so my piece of timber is 1400mm long, so that i can screw it into the studs and have extra.

Step 3: Arranging the Mounts

I placed my monitors into the mounts and onto the timber. Arranging them so that each monitor touched each other.
When you have got the position right, mark the mounts location so that you can screw it into place perfectly.

Step 4: Screwing Brackets to Wood

Attach the brackets to the timber backing piece. Use all the possible screw locations as there will be a large amount of force on the timber piece, the more screws the more secure. Check that everything is aligned correctly.

Step 5: Attach to Wall

In order to attach the timber backing board to the wall it is best to remove the monitors from the timber piece.
Cut off any excess timber that you don't require from the ends.
Locate your studs in your wall.
Using a level mark out the placement and height of your mounts.
Pre drill holes in the stud, so the screw will thread better.
Attach the backing plate to the wall with heavy duty screws.