I suppose the title says it all: does the mining bonus depend on how many turrets you have mounted, or does it only depend on whether or not you hit the rock with one?
I'd like to know, since I just bought my mining ship and I'm still setting it up.
Don't worry about blindspots. Turret view doesn't work all that great for mining since a lot of the time you have to wait for your turrets to turn around to hit some rocks. Also, with the camera pulled back a bit as it is in turret view you will not be able to see a lot of the rocks in front of your ship. I just have one laser on the front of my mining ship, go to cockpit view and just keep doing back flips. I find it is much easier to do it this way.