- This generator produces maps, but I have no idea how they are imported in Foundry and how generator-specific map geometry is converted into los-blocking walls (the generator itself knows nothing about line of sight) . You may want to ask the author of the importer you use about those walls.
- In the generator you can enable Layers > Grid > Small tiles to make the grid squares twice smaller. I'm not sure about Foundry, maybe some additional actions are required to make it work there.