Create the tour in a folder using 3DVista. This will include an index.htm file. Name the folder appropriately. In wordpress go to file manager and upload this folder into wp-content/uploads/
This will then give a link address as per the test example of..
https://orcaeducation.com/wp-content/uploads/Vista%20Tour%20Test/index.htm
You can then attach this to an image use and placed on the grid below.