You can check the landing page by doing a speed test. Use
https://www.dotcom-tools.com/website-speed-test.aspx ad it will allow you to test your website through 25 countries, if all of them can be reached your landing page is good to go.
You also need to test readability. Have a friend who your targeting in native language read it for you and they will tell you any grammar issues to fix. Don’t be afraid to hire a writer, there’s plenty on Fiverr and you can also use Transey for translations. Don’t think about using Google Translator, you may get away with it. Native people can tell if you are a foreigner or not.