You can add unlimited products as you want with this extension.

Yes, of course. It totally adapts and fit in all screen.

Yes, of course. You can remove the discount label in the Promotion Bundle. You open the admin panel and go to the promotion-> configuration

There are 2 types of the discount such as percent and fix.

This product supports 3 types of product: Simple Products, Downloadable products, and Configurable products.

You can add unlimited groups in the main products.

Yes, you can. Please refer go to the admin panel -> configuration ->promotion title

You can easily manager promotion bundle in a separately tab and add/ edit/ disable promotion groups. Please refer our guide here:
Go to the admin panel -> Promotion -> Promotion information> Disable or Enable

Yes. You can modify the product at your discretion for your own web-sites. However, you can’t resell or place the modified extensions (as whole) for downloads on your websites.