So long as you follow the rules above and camp above the highest fall line, then its all about finding the perfect spot. I try and find somewhere which is obviously flat, and ideally protected from the winds – I actually want to sleep and not have my tent battered by winds all night, remember you are higher up the mountains so its not like your camping on ground level.
My next thoughts are where do I want to be the next day, if I am climbing a mountain, I try and get as close to the summit as possible so that I am the first one up the next morning, depending on the time of year I might even get up before sunrise so that I can sit on top of a mountain and see the sunrise.