Questions for landscape photographers

1.  Now that I have a 5d3 it will be that

2. 24-70 2.8

3. F8 maybe f12

4. Focus point. Actually I sometimes set the cameras focus point to one of the single points near the center bottom which s automatically 1/3 of the way in and it does it automatically but sometimes I focus and recomposr

5. YYes

i would love to hear people's thoughts on #4 about setting one of the focus points at the bottom and shoot away.