If you choose a single and stack it with a speed oven, micro or combi/steam oven you'll have a range of choices. Check AJMadison for options and specs.

For example at the top end this Gaggenau steam is 30"x17" high.Gag combi And could be paired with this single wall oven. Which is 30"x26-3/8" high. Total is 43-3/8" without the warming drawer pictured.

The standard height for 30" double ovens is between 49 and 52". Even the Speed/Oven combo is in the 48/49 range, Dacor has an integrated combo speed, traditional, steam, wifi, orders Uber if you had too much to drink, oven that is only 43" tall. http://www.dacor.com/products/wall-ovens/modernist-combination-wall-oven I don't know anything about it though.