I used what appear to be the identical cleats on my last frame, although in a different package. I used four since it's on my back wall and didn't want it to rattle with any bass hitting it directly. Here's what I did, although mine was on the bottom of the wall, so you may need some help to do this...
I mounted the half on frame, two on top, two on the bottom. This was tricky, because I want to be able to remove the panel. If all four are mounted inside the area of the frame, you won't be able to lift it off. So, I mounted the top two on the inside and the bottom two on the outside, "upside down." This allows all the cleats on the frame to be pointed in the same direction ("down") for lifting up and off the wall. Because the frame is on the bottom of the wall, the bottom cleats will be covered by base molding. I used a couple of scrap pieces of wood on the floor to set the frame at the height I wanted, then went around and marked where the other half of the cleat needed to go on the wall. I removed the frame and mounted all the cleats.
The thing is, you only need to be close. Even though it looks like there is not much overlap in the cleats, it doesn't take much. And if one is not exactly level, as long as the top cleat fits into the bottom for most of the length, you still can still get the frame set level.
Hope this helps!
Here's the pick of the ones I used.....Edited by tlogan6797 - 2/14/13 at 8:41am