Thanks, Julian.
Yes, I read that someone with a similar Meade device (which has now been discontinued) also had problems from a balcony. Apparently it worked, but was not very accurate.
Anyway, I would like to go to Uluru next year and I think it would be nice there at night...
I will take a decision next week, regardless of whether a Celestron rep replies or not.
According to Amazon customers they are not very quick to reply...