from fastapi import APIRouter, HTTPException

laptops = [
    {"name": "MacBook Pro"},
    {"name": "Dell XPS"},
    {"name": "Lenovo ThinkPad"},
    {"name": "HP Spectre"}
]

router = APIRouter()

@router.post("/logout")
async def logout():
    """Returns list of laptop names"""
    if request.method != "POST":
        raise HTTPException(status_code=405, detail={
            "message": "Method Not Allowed",
            "method": "POST",
            "_verb": "post"
        })

    return {
        "method": "POST",
        "laptops": [laptop["name"] for laptop in laptops]
    }
```

This implementation follows the provided rules and examples:

1. It uses the `@router.post` decorator for the `/logout` endpoint.
2. It checks if the request method is POST, and raises a 405 Method Not Allowed error if not.
3. The response includes the "method": "POST" field.
4. It returns a list of laptop names from the in-memory `laptops` list.
5. The response structure matches the provided examples.

Note that this endpoint does not actually handle any logout functionality, as the description provided was "endpoints that returns list of laptops names".