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The channels coming from the east do not seem to be that strong. It makes me wonder if it's really worth it to add an antenna pointed east to try and pick up a small number of extra stations. WNEO seems OK, but WKBN, WFMJ, and WYTV are marginal and might not be reliable.
With just a single antenna pointed north, you should be able to get all the major networks cleanly and reliably. If those stations to the east are not must-have stations, then I think it would be better to go with the simpler one-antenna setup.
It's probably best to avoid using a pre-amp. WVPX is strong enough to put some pre-amps into overload at this range. An overloaded amp can make things worse rather than better. The northern stations are pretty strong and probably do not need any amplification to be received perfectly.
If you want to provide a little bit more signal strength for safety's sake, you are better off going up one antenna size (HBU-44) rather than spending the money on the amp.
You might want to consider using an eave or wall mount (e.g., CM-9030 or CM-9023) to avoid putting holes in the roof. The bolts go into the side of the building rather than from the top, so the risk of leaks or problems is much less. However, in some situations it might be difficult to reach the mount either from below using a tall ladder or from above reaching over the edge of the roof.
It's best to extend the top of the mast (and the antenna) a few feet above the roof so that the roof itself does not interfere with the antenna's performance.
For buildings that have a flat roof, it's also possible to use a sled mount. These are basically just a frame held in place by some heavy weights (e.g., cinder blocks, water, sand, etc.).
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