My question is, do we need to get AP on every charts we are trading, or if it's open on let's say EUR/USD only, it can manage TL on EUR/AUD trades too, etc etc ?
Sorry for my ignorance, but I have no idea what TL is. As for the Account Protector, it will work with ALL trades on ALL charts by default unless you set up the Filters to work only with particular pair, comments, or magic number.