I'm using the Marineland Double Bright, as well. Feel free to peruse my journal to see how I have it suspended in a situation where a shelf wasn't an option.
About filters/flow. I didn't think my Eheim 2232 would provide enough flow but I'm now finding it has the perfect amount. My DIY spray bar made from Lee's Rigid Tubing works really well.
In a low flow scenario, it's also possible to use a small powerhead to increase flow. I bought a few of different sizes just to be safe and find that the Koralia Nano 240 works well, though isn't needed in my case.