I'd want that a bit lower myself, it's ok up there if there's a screen to tuck it behind.
As for using the satnav to know what is up ahead, I see no issue at all with this - I do it regularly - I did it on my Europe trip in Belgium in the ****ing rain, glancing every so often to see what bends were coming up. Last thing you want is to be surprised by a hairpin bend in heavy rain on roads you don't know...
Obviously you don't use it for the bend you're currently on, just to see the road ahead. It's also handy when you're stuck behind a slow car, if you can see there's a straight not far away you know you don't need to make a risky overtake to get past, and can wait.
Would you prefer to not know there's a 180 degree hairpin bend just over that blind crest, with no signs to tell you (as is normal in Europe)? The more information, the better - unless you rely on it of course, which is bad.