My own view is to either raise nucs in a separate yard, several miles away, or keep 'em in the home apiary protected by anti-robbing screens. Distancing them away by a few hundred yards is neither here nor there - as they're still 'well within range'.
Because I have just the one home apiary (by choice), I've decided this year to start-off all my nucs at the beginning of the season (even though, as I use standard frames, this procedure is heavy on bees) so that they'll be at the largest possible size come August, which is the start of the 'robbing season' around here.
I'm not a great fan of mini-nucs, although I can see how they would appeal to a queen producer. If I ever decided to go down that route, then I'd use half-length frames (9" depth) in divided five-frame nuc boxes, and I've been cutting partition grooves in all nuc box builds for some time now, just in case I should ever decide to venture into queens.
LJ