biscuitbaby

KBSP Spacer & Ad Blocks lets you easily insert preset blank spaces (1 or 2 lines) and a single ad placeholder (banner1) into your posts and pages. 
It works with both the Classic Editor and the Block Editor.
In the free version you can use the following: 
* Blank spaces with 1 or 2 line presets. 
* One ad placeholder block.
A Pro version offers additional features such as custom heights and multiple ad placeholders. 
Get the Pro version at: https://biscuitbaby.gumroad.com/l/blankblockpro?wanted=true
<h3>Blocks</h3>
This plugin provides 2 blocks.
<ul>
<li>Blank Space </li>
<li>Ad Placeholder</li>
</ul>
<h3>Upgrade</h3>
Want more features? 
The Pro version includes custom spacing heights and multiple ad placeholders. 
Available here: https://biscuitbaby.gumroad.com/l/blankblockpro?wanted=true

KBSP Spacer & Ad Blocks

Easily insert customizable blank spaces and ad placeholders into your posts and pages.

kb_unhammer

This is a very simple plugin for the default (TinyMCE) editor. It adds 
a button that puts in a paragraph which won’t get deleted by the 
linebreak-eater (the one that starts munching when you press 
“Publish”).

Empty Paragraph for TinyMCE Editor

Adds an editor button that puts in an empty paragraph which won't get deleted when you save.

KBSP Spacer & Ad Blocks vs Empty Paragraph for TinyMCE Editor