Plugin using plugin-outlet only for homepage

I am developing a plugin for our community forum. I followed the tutorials on here and have gotten pretty far. The main issue is that we really only want these added sections to show up for the homepage or index route. Similar to how works. They are even using the same outlet I am below-site-header.

I searched all over and found few answers to this question also, tried reverse engineering a few other plugins that accomplished similar things, but to no avail.

Any help would be greatly appreciated. Thanks in advance!