Your setup depends heavily on your main sleeping shelter. If space and weight isn’t a concern, always go a bit bigger than the number of people. For example, a single person will have an easier time in a 2-person tent. Two people will find it easier in a 4-person tent.
How big is a standard campsite?
Standard Campsite – 20′ x 30′ Standard Long Campsite – 20′ x 40′ Standard Electrical Campsite – 20′ x 30′