A:AnswerIf you're looking to cover the back also, I would recommend you look at another brand. I can't imagine this working well with anything that would cover the back.
A:AnswerApple’s Smart Keyboard Folio, and Magic Keyboard (make sure you verify your iPad generation. IE: 3rd Gen vs 4th Gen as the camera cutouts are different. Logitech and other brands offer great alternatives.
A:AnswerI use this keyboard in lieu of protective case. It will not fit with additional protective case because of how it attaches to iPad 7 (along bottom).
A:AnswerYep, you sure can. Just as you would with any other apple product’s keyboard. Simply hold down the desired key - and select the letter. Example: letter N (ń,ñ,n)