My friend has a table tennis net in his basement and the net isn't that tall actually, it's probably like half a foot or such. It's hard to tell from my perspective but it shouldn't be very high
A table is 9 feet (2.74m) long, 5 feet (1.525m) wide and 2 feet 6 inches (76cm) high ... and the net is 6 feet (1.83m) long and 6 inches (15.25 cm) high.