How to add a custom div around ads?

You can put whatever you want in your adcode, adding the wrapper there.

If you use groups you can use the wrapper in the groups wrapper code fields which may be easier to manage long term.

Hello,

thank you for your prompt reply!

I’ve tried adding the wrapper under “Manage Groups -> Wrapper code”.

Code output is like this:

<div class="g g-2">
  <div class="g-single a-8">
    <div class="banner-wrap">

I need the code to be like this:

<div class="banner-wrap">
  <div class="g g-2">
    <div class="g-single a-8">

Is there a way to achieve this?

Is the scenario described above possible?

Yes if you use a PHP snippet or shortcode, otherwise not really.
https://ajdg.solutions/manuals/adrotate-manuals/show-adverts-on-your-site/