Hi there,
For the advertiser blocker app, the format you sent with one URL per line is correct. However please only enter root domain like this zenithbank.com without any additions such as https or www otherwise it will not work properly.
Normally it will take about 24 hours for our system to detect the changes and to block the advertisers on your site.
Putting a placeholder in the feeds on your homepage homepage or category page should have the same effect as an Adsense in-feed unit. These instructions should help you to be able to place the ad placeholders:
https://support.ezoic.com/kb/article/using-the-ezoic-chrome-extension