Mambo Merge is built for the Salesforce Lightning user interface, but it can be used in Salesforce Classic with just a little extra setup.
At the time of this writing, Lightning Web Components cannot be added to Classic Page Layouts. However, Visualforce Pages can be added to Classic Page Layouts, and Visualforce Pages can display Aura Components, and Aura Components can display Lightning Web Components.
We have provided some samples for you in the Mambo Merge Recipes github repo located here: https://github.com/mambomerge/mambo-merge-recipes
You will need to first create the Aura Components located here:
And then an example of a Visualforce page: