What multiplayer asset should I use

I got 2 questions here-

  1. Is it possible to make a large scale multiplayer game (maybe 50 players per match)?

  2. Which multiplayer asset/solution should I use from the asset store (free)? I tried making my own, of course everything went haywire and I have decided to use an asset, but there are too many, if someone experienced in making multiplayer games is looking at this it would be great if you could recommend a good asset and maybe give your reason for the recomendation