I have used aluminum channel to attach the LED's to from a fellow canreefer. If he would like to post on here who he is, I will leave that to his choice. I owe a big thank you to him for getting me the channel at a great price, delivered right to my door, and cut to the exact measurements I needed. Here is some pictures of the channel attached to my canopy.
I put a screw on either end of the aluminum channel into the wood to hold them in place.