Box filter should be ok...but the inlets might be large enough to suck up baby shrimp. By box filter I assume you mean those clear plastic corner filters that are powered by an airpump. If you mean the HOB filters, they are fine too as long as you have some sort of pre-filter on the intake.
The sponge filters are preferred since the shrimp are safe and they love to crawl all over it and pick at the sponge eating whatever they find.
I prefer substrate, just more natural but that's just my opinion.
Shrimp LOVE plants. Make sure you have some moss too. They really like going through it eating the biofilm and stuff.
Clean water is important and stable conditions even more so.
My tank isn't what I would call low flow but the shrimp seem to be doing just fine.
Here is a shot of one of my girls...
I have a tank of yellow neos too. They are really neat as well.