How deep is the lake? We aren't allowed to plant brush,wink wink, but if I did I would take in consideration of easy of fishing a spot. I would consider how much boat traffic, prevailing wind conditions and my type of fishing, when does the thermaclime set up and how deep, and time of the year that I would be fishing the spot. Your best bet would be to stagger them in different depths. This way you can catch them year round.
Get the fish finder your using and turn resolution up,and look for those small odd ball spots. Look for those spots where the depth goes from 15 feet deep and it jumps up to 12 feet that's where I would dump some brush. No matter what a map says there are always spots that differ from the surrounding spots.
In the second picture there is a spot way out in deep water where there is a bridge between the 20 foot marks, right between the 11 and 2 foot marks on the map. That is where I would load the spot for summer and winter fishing.