Configuring WebDav through ServerManager

I want to configure my IIS virtual folder to enable WebDav publishing. I can easily do it manually but I wanted to do the same thing via code, in C#. I have no problem in creating sites or virtual directories and even adding properties such as mime types to them, but I can't seem to access the WebDav settings that should be in my applicationHost.config file. I've made multiple attempts like this. Obviously this snippet does nothing, it's only there to show you what I was toying with.

using (var serverManager = new ServerManager())
{
    try
    {
        var app = serverManager.Sites.FirstOrDefault(o => o.Name.Equals("custom"))?.Applications.First(o => o.Path.Equals("/"));
        var config = serverManager.GetApplicationHostConfiguration();
        var web = serverManager.GetWebConfiguration("custom");
        var setting = config.RootSectionGroup;
        var admin = serverManager.GetAdministrationConfiguration();

        serverManager.CommitChanges();
    }
    catch (Exception e)
    {
        Console.WriteLine($"Error when creating virtual directory: {e.Message}");
    }
}

I've tried using all those methods but I can't seem to access these sections which are located at the end of my applicationHost.config file. The second one is my virtual folder. WebDav functionality is active, I've tried connecting to it by using some applications and it works fine. What can I do? Thanks in advance.

<location path="custom">
    <system.webServer>
        <security>
            <requestFiltering>
                <fileExtensions applyToWebDAV="false" />
                <verbs applyToWebDAV="false" />
                <hiddenSegments applyToWebDAV="false" />
            </requestFiltering>
        </security>
        <webdav>
            <authoring enabled="true">
                <properties allowAnonymousPropfind="true" />
            </authoring>
        </webdav>
    </system.webServer>
</location>
<location path="custom/local">
    <system.webServer>
        <webdav>
            <authoringRules>
                <add users="*" path="*" access="Read" />
            </authoringRules>
        </webdav>
    </system.webServer>
</location>