Yes, it seems only miniDIMM and SODIMM have angled and horizontal sockets with small footprint.
http://www.chefung.com/en/pdf/987651-3391%20DDR4%20miniDIMM%20Sockets,%2022.5%20Angled%20and%20Vertical%20SMT,%20Halogen-free.pdf
I guess my only option to work out high profile memory, or switch to...