It's easy to make a 'rack' from electrical conduit and still use fixtures that hang and not do it from the ceiling or the wall. HD or Lowes will even bend the conduit for you so all you have to do is install it... and maybe paint it if you don't like the look of galvanized pipe. Then you can look at less expensive fixtures.
Do you want the sunrise/sunset ability in your fixture?
Do you want moonlights?
I have had 2 OceanRevive OR-IT2080 fixtures over my 6' long 180g tank for over 2 years now and haven't had a single issue. BTW, I max my power settings at 90% blue and 40% white, so there is plenty left to reach the bottom of your tank that is 3" or 4" deeper.
If you don't care about the controller or moonlights, then Arctic S026 or T247 fixtures provide similar PAR and cost much less. I use them over my frag tanks.
