tabs-default-placeholders.cshtml

<div class="tabs-container">
	<ul>
		@foreach (var tab in Model.TabItems) 
		{
			<li>@tab.Title</li>
		}
	</ul>
	@{
		int i = 0;
		
		foreach (var tab in Model.TabItems)
		{
			<div>
				@Html.Sitecore().DynamicPlaceholder("tab", seed: i)
			</div>
			
			i++;
		}
	}
</div>