Sitecore WFFM Input field with Placeholder

PlaceholderInput.cs

using System.ComponentModel;
using Sitecore.Form.Core.Attributes;

namespace MyProject.CMS.Custom.WFFM.Fields
{
    public class PlaceholderInput : Sitecore.Form.Web.UI.Controls.SingleLineText
    {
        [DefaultValue("")]
        [VisualCategory("Appearance")]
        [VisualProperty("Placeholder Text:", 200)]
        [Localize]
        public string PlaceholderText { get; set; }
    }
}

PlaceholderInputField.cs

using System.ComponentModel;
using Sitecore.Forms.Mvc.ViewModels.Fields;

namespace MyProject.CMS.Custom.WFFM.Fields
{
    public class PlaceholderInputField : SingleLineTextField
    {
        [DefaultValue("")]
        public string PlaceholderText { get; set; }
    }
}

PlaceholderInputField.cshtml

@using Sitecore.Forms.Mvc.Html
@model MyProject.CMS.Custom.WFFM.Fields

@using (Html.BeginField())
{
    @Html.Editor("Value", new { FieldModel = Model, htmlAttributes = new { placeholder = Model.PlaceholderText } })
}