Weng, research ka muna sa website ng Audyssey. The Wides have a better impact but the angle should be 60 degrees, not 45. The Heights are ideally at 45 degrees while the fronts should be 30 degrees, kaya mali ang proposed mo na location ng Heights kasi parang halos same angle as the fronts ang proposed mo.
Actually, for many people, the Heights are preferred kasi they can be mounted sa walls kaya they don't take floor space. Kung ako sa iyo, just make a choice depending on aesthetics and convenience.
EDIT: Actually, the theoretical ideal angle for the Wides is 55 degrees, not 60 degrees. Kung d pa kaya yun, whatever is the best possible compromise should do. The rules are not hard and fast.