With nems, you really don't know what (or where) they're gonna like (or end up). Back with my 90, I had so much rock in there the nem didn't really have a choice BUT to call home the front of the tank. Back then, one aimed for about 2lbs per gallon. But with today's recommendations of 1lb per gallon, it could end up in the back of the scape halfway out of a cave, lol. They will move around until they find a place they are comfortable, based mostly on lighting and flow. You can always adjust the lighting and powergead output, which may cause it to move, but again, ya never know where it's gonna end up. But don't let that stop ya. You have an idea that you want to do, then go for it.
Oh! Another thing......Get covers for your powerheads. I've heard too many stories of nems get caught in those things. It always ends badly!