Diver duck spread

Got a couple questions for y'all, since me and my son went diver duck huntin a couple weeks ago it's sparked an intrest in him. I know the area we were in bc I lived down there for 10 years charter and commercial fishin just never duck hunted not even knew there were any ducks to hunt.
When we went we hunted from the shore, so that's what we are going to try next year, question is. When I'm down there this summer scouting for places/ fishing for trout and reds, should I be looking for points, coves, or just flat shoreline? Also how big of a spread? I've heard any where from 1/2 dozen to 15 dozen. Any help would be greatly appreciated.
When we went we hunted from the shore, so that's what we are going to try next year, question is. When I'm down there this summer scouting for places/ fishing for trout and reds, should I be looking for points, coves, or just flat shoreline? Also how big of a spread? I've heard any where from 1/2 dozen to 15 dozen. Any help would be greatly appreciated.