枫叶卡 can only be mailed to the address in Canada? and...

Hi I am planing to land Canada in July and stay for a couple of days then be back to USA. Should I find a someone residing in Canada in order to receive 枫 叶卡 for me after I get back? Or I can ask them to mail 枫 叶卡 directly to the address in USA?

Besides, how many days do I need to stay there in order not to get trouble when landing? Bank statement of USA is enough to show my finance supporting?

Any ideas would be greatly appreciated!