script organizer add google tag manager where is body tag

how can add script for GTM ate the start of bodytag? 

Scripts Organizer

im confused with sandbox plugin

I am very confused with the sandbox plugin, I saw that there is a free version that is at 2.0 but not updated for 1 year, then there is the pro version that I bought and installed that is at version 1.0.5 I don’t understand how it is possible, what differences are there?

SandBox Pro

Script manager Allow CSS/JS Uploads on specific page

Hi, I don’t see the option to enqueue file in a specific page, how can I achieve this?    best regards

Scripts Organizer