About a year ago I was looking for flow advice for placement. As non-helpful as any of these replies are, I'm sort of a little bit jealous you got replies at all.
But as non helpful as the replies are .. they are correct. Put them where you want them. Then adjust the programming so that you get what you want out of them.
Done and done
Took me a few iterations and placements and program settings before I got something I was sort of happy with. But seeing as every tank is unique, what works optimally for one person won't be as optimal for another .. you have to tweak and evaluate and adjust.