Sample view to render the TagManagerElementBlock.cs values for editors in edit mode and hidden input fields in the form.

TagManagerElementBlock.cshtml

@using EPiServer.Forms.EditView
@using EPiServer.Editor
@model AlloyWithFind.Models.FormElements.TagManagerElementBlock

@* if in edit mode render the GTM values so that the editor can see them *@
@if (PageEditing.PageIsInEditMode)
{
    <span class="Form__Element FormHidden @Html.Raw(ConstantsFormsUI.CSS_InvisibleElement)">@Model.EditViewFriendlyTitle</span>
}
else
{
    <input name="gtmFormName" id="@(Model.FormElement.Guid)_name" type="hidden" value="@Model.FormName" class="Form__Element FormHidden FormHideInSummarized" @Html.Raw(Model.AttributesString) data-f-type="hidden" />
    <input name="gtmCategoryName" id="@(Model.FormElement.Guid)_category" type="hidden" value="@Model.CategoryName" class="Form__Element FormHidden FormHideInSummarized" @Html.Raw(Model.AttributesString) data-f-type="hidden" />
}