Start by measuring your available space—aim for a desk 100 to 120 centimetres...

https://wiki-legion.win/index.php/Do_I_Need_a_Desk_for_Cloud_Gaming%3F

Start by measuring your available space—aim for a desk 100 to 120 centimetres wide to fit your gear comfortably. Use a monitor arm to free up desk surface and create more room for your keyboard and mouse