I used the exo terra or zoomed hanging bracket thing. It sticks to the side of the tank and you can suspend the light from it.
This is a really old picture, but if you look close at the tank in the background you can see a ceramic heat emitter hanging over the tank using one of those bracket things.
I adjusted the hight of it till it had the tank temps where they needed to be at. ..... AND wow that was an awful tank lol