Since you are already on WordPress, there are two easy ways to achieve what you want.
1. Target the Icegram campaign to show on the entire site.
2. Use a shortcode to embed Icegram campaign on your “Coming Soon” landing page.
Both of these are available under “Targeting Rules” in Edit Campaign.
Icegram’s shortcode to embed a campaign on a page looks like this:
[icegram campaigns="6009"]
To summarize:
- Install Icegram and create a new campaign on the site with Ultimate Soon Page plugin installed
- Add a popup as the only message in this campaign. Set the display time and other elements per your choice.
- In Targeting rules, you may select “Sitewide” (and the popup will show on every page) or don’t tick any boxes under targeting and only copy the shortcode from here. And then paste the shortcode on the Coming Soon Page’s content.
- Save and publish the campaign.
- Test and verify!
Let me know how that goes!