Is your swim platform smooth on the underside?

My 2018 is a lot sturdier vs my previous 2007 - the mounting to the transom and the construction of the swim platform.

The original 2007 platform was not solid on the underside and there was a lip around the exterior of it. Even when I changed it to a solid surf platform, I also wondered if the original mounting brackets were strong enough to support add'l weight and strain of peeps getting up. Thus I never mounted one.