Hi Erin,
Within a couple weeks we will be launching a new gallery card in the site editor, which will be linked with a specified group and display the apps. In that respect, if you don't need this done immediately, I'd suggest to wait for the gallery card. It will be a better experience for your users and will better fit the page styling. Further down the line we will expand the gallery card to include datasets.
If it's urgent, I have seen an example where a site used a gallery in an iframe. I think they may have used this template - https://www.arcgis.com/home/item.html?id=34505d89a3b34be09b65b98938974390
Courtney