SaveMXS API Call Issue

Hello, I am having difficulty with the name parameter on the savemxs WHM API call. I have it working successfully where it will update the records correctly. However, because the name parameter is required, I am not able to set up the MX record properly through the API call. For example, with GSuite, the Name field should be blank or @. If you create the MX Record manually via Edit Zone Records, that is not an issue. However, if you leave the name parameter blank on the API call, it doesn't work. Here is what my current JSON request looks like for 'testdomain.com':