The way i would design it for your tv,
1st i would make it flush againt your tv but to give it protection i would use some of those little gel circles you get for example on a glass table they go between the actual table and the piece of glass. If you really dont know what i mean i will take a pic of one.
Now for hooking it onto your TV, I would do similar to what have you done but make the brackets the width of the black border going down the side of your tv, paint them black then bolt it to the glass with black nuts and bolts using a washer aswell so the order threaded onto the bolt would be washer,glass,bracket and knut.
But before screwing them all on screw one on to see if you have any excess screw sticking out, if so either use shorter bolts or measure and cut it down to give as much of a flush finish as possible.
But before this you need to create the actual bracket, I would make this out of say one piece of steal bent in a upside down U shape to the width of your tv. The to finish off line the inside with felt to protect your tv.
If your really clever you could bend the bracket in to make more of a clamp like a bulldog clip just to make sure its nice an tight.
Hope that helps