How to parallelize with NUnit at the method level

ParallelAtMethodsWithSelenium.cs

[TestFixture]
[Parallelizable(ParallelScope.All)]
class ParallelAtMethodsWithSelenium
{
    private sealed class TestScope : IDisposable
    {
        public IWebDriver Driver { get; }
        private string SauceUserName { get; }
        private string SauceAccessKey { get; }
        private Dictionary<string, object> SauceOptions { get; }
        public TestScope()
        {
            var chromeOptions = new ChromeOptions
            {
                BrowserVersion = "latest",
                PlatformName = "Windows 10",
                UseSpecCompliantProtocol = true
            };
            //TODO please supply your Sauce Labs user name in an environment variable
            SauceUserName = Environment.GetEnvironmentVariable("SAUCE_USERNAME", EnvironmentVariableTarget.User);
            //TODO please supply your own Sauce Labs access Key in an environment variable
            SauceAccessKey = Environment.GetEnvironmentVariable("SAUCE_ACCESS_KEY", EnvironmentVariableTarget.User);
            SauceOptions = new Dictionary<string, object>
            {
                ["username"] = SauceUserName,
                ["accessKey"] = SauceAccessKey
            };
            SauceOptions.Add("name", TestContext.CurrentContext.Test.Name);
            chromeOptions.AddAdditionalCapability("sauce:options", SauceOptions, true);

            Driver = new RemoteWebDriver(new Uri("https://ondemand.saucelabs.com/wd/hub"),
                chromeOptions.ToCapabilities(), TimeSpan.FromSeconds(600));
        }

        public void Dispose()
        {
            //clean-up code goes here
            if (Driver == null)
                return;
            var passed = TestContext.CurrentContext.Result.Outcome.Status == TestStatus.Passed;
            ((IJavaScriptExecutor)Driver).ExecuteScript("sauce:job-result=" + (passed ? "passed" : "failed"));
            Driver.Quit();
        }
    }
    [Test]
    public void Test1()
    {
        using (var scope = new TestScope())
        {
            scope.Driver.Navigate().GoToUrl("https://www.saucedemo.com");
            Assert.AreEqual("Swag Labs", scope.Driver.Title);
        }
    }
    [Test]
    public void Test2()
    {
        using (var scope = new TestScope())
        {
            scope.Driver.Navigate().GoToUrl("https://www.saucedemo.com");
            Assert.AreEqual("Swag Labs", scope.Driver.Title);
        }
    }
}