The Ostrish Fern should be good with the ivy. I have a bed that has the Ostrish and Ivy but the Japanese Ferns seem to be prima donnas. It takes them a long time to get established and they come up later than my other ferns. So you may have to keep an eye on them and make sure the Ivy and Ostrish fern do not try to bump it out of your garden.
That said I have a bed that has ostrish fern, and Japanese Fern and a few other ferns with my hostas and I only have to thin out the ostrish ferns once they started to get aggressive.
If these are recent plants they all do not look good the first year just keep them moist and they should lookd good next year.
