Trim rounded tops off cakes. Place 2 of the cakes, side-by-side, on parchment-covered wire racks. Spread lightly with small amount of the cream cheese mixture. Stand remaining cake on one of the short ends; cut diagonally in half to make two triangles. Place triangles on iced cakes in shape of pyramid to resemble roof as shown in photo
. Spread entire cake with remaining cream cheese mixture. Transfer cake to serving platter.