1In the MapPress settings filter section, you can choose category, tags or any other taxonomy.
The filters only apply to mashups. So, create 1 post per location and add a map to each post with its location.
Then create a post or page for the mashup. If you’re using Gutenberg, there’s a mashup block. In the classic editor, you can use a shortcode. This one will display all maps:
[mashup query="all"]