Seen a local reefer using light defuser as a frag rack. Bought some from Home Depot for $16. I did not think about this, is that material ok to put in a reef tank?
Some guy on Reef2Reef sells really nice legs to hold up eggcrate/light diffuser. They come in different heights. I believe he offers them through Etsy:
I did mine like this:
Used reef glue to attach suction cups to eggs crate and after glue dried for 24 hours placed a zip tie through it just to be sure it held.
If you have some extra magnet scrapers you can glue one to the rack and lock the other on the outside of the tank. Position it where you want.
I also went to the dollar store and got these little 2" square mini ceramic flower pots. I epoxy them to the underside middle of a length of grid and the make a perfect stand. Also heavy enough to keep the stand from moving around.