Here’s an OSU article about growing kiwi, very extensive! https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/pnw507.pdf
Do you know what cultivars you have? The OSU article mentioned vines commonly being planted 15 ft apart, but that is for commercial growers growing in rows. But, I think it at least implies that within 15 feet the male should be able to pollinate the females.