Looks right to me! But I agree with Leslie that they will need more room soonish. However, they grow much slower than most other iris I have. But maybe I'm just doing it wrong?
I grow mine in pots too or they would get too much moisture. I got them last year and so far I am happy they survived the winter here! They are still fairly small and I don't expect them to bloom this year - but then I wasn't sure they would survive at all, so who knows?