Planning a gaming setup in limited space starts with a desk around 100 to 120...

https://mega-wiki.win/index.php/How_to_Store_Controllers_and_Cables_So_Your_Desk_Stays_Clear

Planning a gaming setup in limited space starts with a desk around 100 to 120 centimetres wide to fit your monitor and keyboard comfortably. Use a monitor arm to free up surface area and keep cables neat