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Since most of your channels are in the "red" zone on your list and they have fairly low Noise Margin numbers (mostly around -5 to +5 dB), I'd err on the side of going with a larger antenna (like the HD7697P or HD7698P) and mast-mounted a pre-amp (like the Winegard AP-8275, Channel Master 7777, or Antennacraft 10G202).
To answer your question about the static antenna mount, yes, you should be able to pick up all of southern channels with a single antenna position. It might take a little bit of fine tuning to get the aim right initially, but I think it will work.
The channel spread is about 37º (that about +/- 18.5º from center). The first deep nulls in these kinds of antennas are at least about +/- 25º from center (and usually even wider for the lower channel numbers).
I would aim the antenna between the clusters at compass headings 138º and 154º. The cluster at heading 175º is entirely VHF channels, any they should have no problem getting in through the much wider VHF beamwidth of these antennas.
As for the power lines, it's hard to say. Any time there are objects in the field of view of the antenna (imagine a spotlight with a "beam width" of about 30º - 40º), there is the potential for excess signal reflections and interference to work their way into the signal feed.
Transformers have been known to generate a lot of interference sometimes, so if you don't have any nearby, consider yourself lucky.
If the signal must pass through a bunch of wires to reach you, then they WILL have an influence on your signals, but it's hard to say how much. The further away they are, the better off you will be. A picture might help us get a warm and fuzzy feel for the situation, but even then, all we can do is guess. There's no sure-fire way to know until you try it.
BTW, if the power lines are close enough to be touched by the antenna and/or the mast, be very careful when doing the installation to avoid getting electrocuted.
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