Black diamond's Megamid, and the Mozzy net inner tent are not freestandoing, would need staking down at the 4 corners , but they are a Pyramid shape with a square floor , floor is sewn into the mozzy shelter , so you can fold up the sides to get abundant ventilation one center pole . hard surfaces a bag filled with rocks will substitute, for a tent stake ,
If there is no significant wind to speak of . good shape for run off and wind spillage .

Capt Scott used a Pyramid tent for their ill fated race to the south pole with Amundsen, in 1912
when they found his tent, it was still up, after an antarctic winter or so.