Can I put a z-block on the cart page?
Yes, it is possible to add a block to the cart page within the out-of-the box functionality of the Z-Blocks extension. You can place z-blocks in any position by changing CMS page layout. You can choose one of the predefined positions or use a custom one when placing blocks on your web-site pages.
Custom Static Blocks for Magento 2, a Z-Blocks successor has pre-defined positions specifically for Cart and Checkout pages. The core design of the module has been significantly improved and simplified, so now it is much easier for admin to set it up and use.