Jabawack

Simple Custom Posts per Page (SCPP) allows to configure the number of posts displayed for every custom post registered in WordPress.
See <a href="https://wordpress.org/extend/plugins/simple-custom-posts-per-page/screenshots/" rel="ugc">Screenshots</a> to known why it is called “Simple”.
In your Readme page in Setting tab of WordPress, it adds an option for every post type.
Disable Plugin in Template: 
You can disable plugin filters in your template whenever you want. Maybe you need a query with a different number of custom posts per page for a specific post type. 
Using this code before your query, the filter plugin will be disabled for a specific post type:
<pre><code><?php $GLOBALS['ado_cspp_disable']="YOUR_TYPE"; ?>
</code></pre>
With this code, you can use your personalized query for your loop.
More: 
You can find more informations in the official <a href="http://www.adostudio.it/blog/simple-custom-posts-per-page-397/" rel="nofollow ugc">Post</a> on my Blog.

Simple Custom Posts per Page

This plugin allows to configure the number of posts displayed for every custom post registered.

FRESHFACE

Posts Per Page customizer allows you to carefully declare how many posts per page you want to show, and where you want to show them using 
our Conditional Logic. It also allows you to filter posts, order them by comments count, date, random, and other possibilities.

Posts Per Page Customizer

Powerful tool to tweak your existing loops. Set posts per page, filter posts, order them, hide them, apply Conditional Logic, etc.

Simple Custom Posts per Page vs Posts Per Page Customizer