/diy/ - Do It Yourself

So I have this old rotted fence on a concrete deck I'm trying to rebuild. Some of the posts are anchor bolted into the foundation using a post bracket (far right post). However most ( 90%) of these posts are fit into these notches in the concrete slab like the post on the left. They have no hardware and fit snug into the notches. They also run into the dirt about 2 feet and are generally rotted out. My solution is to just raise them a few inches from the dirt and drill into the concrete and posts then attach with a T-bracket like the middle picture.

Will this work? I was going to fill the void underneath with a bunch of pea gravel so any water will drain down.