How to make 2 different views in multiplayer ?

I would like to make an independent multiplayer view for each player. Imagine a game like the "naval battle".

Knowing that it is the player 1 who hosts the game, if I understood correctly, player 2 can only see the layout that player 1 sees and not another layout, right?

So I thought I'd do it like this:

The problem is that I wonder if it's possible that player 1 can only see his view.

Secondly, to have such a large layout (I don't know how memory would be managed like there are two players) won't it cause performance problems if I then export my game to mobile? (There will be about 60 sprites on each view about). The layout total size (with the 2 view) is : 3840x 2160.