I think there may be a simpler solution, depending on what you want displayed in the grid, which is to use Visual Composer and our free VC addon, downloadable from here:

https://drive.google.com/file/d/1BFrl7VL3crUImeg9OukRHkoQlRofBJjX/view?usp=sharing

This will add a Visual Composer display results method to the form design. So make a form and make sure it is saved with a unique name. In VC, you will see a new element (blue) to add the search form to the page. Select the form in the settings fro that.

Then add a VC Post Grid element to the page. Here is a screenshot with the standard grids shown:

In the VC post grid the Data Source needs to be set to Search & Filter, and then for you to select the form.

You may need to design your own post layout, using the VC grid builder.

Ah. I see, it does not have the Visual Composer plugin from WP Bakery.

The ideal is to have a page already designed by your theme and filter on that. Do you have a page already designed that has the deign that you want to achieve?

Posts crossing. That is site origin, but we have a similar method if you want to use that. But, you need to build the grid first on a dedicated search/results page, then I can show you how to link the form to it.

(Oops I’ve just seen I’m replying on this thread and not my own! I can see your reply now, sorry for mix up!)