7050 MFF, external GPU setup working?

Hi 

I have a Optiplex 7050 MFF, with a SATA SSD , so the M.2 slot is free. Is it possible that someone here (maybe even Dell themselves!?) knows which type cable I would need for a purchase of the "v8.0 EXP GDC 'Beast' external video card dock"? I can't decide if it's a mini PCIe or NGFF type cable that connects to this onboard M.2 slot. Maybe someone here has even done the build and made an external GPU work on this tiny machine? 
Preferably with AMD GPU's. On http://egpu.io I can only find older 3050 (Nvidia GTX)  builds. 

Thanks :)