I imagine the real question is how do I put my center speaker ontop of the TV if there isn't enough space... I have mine bolted to the wall.
The other alternative would be to get some double sided tape and place your center speaker on as much of the tv as possible and build angled legs to support the back part of your center channel. Of course, this all depends on the size of your center channel speaker...
I use this on my Sony KDF 55XS955 and I love it. I had a problem with my two young cats getting a little to close for comfort with my center channel but this works great. Strong too. I have a B&W 600S3 center and it holds it fine.