A nice invention from the kitefoiling scene: the Remora !
The story: http://www.kiteforum.com/viewtopic.php?f=196&t=2399694
Product presentation and tests: https://www.facebook.com/RemoraProducts/
Web site: soon http://remorasucks.com/
Availability: probably August 2018
Suitable for any foil activity with a 165 x 90mm screw pattern plate including efoil.
If used with an efoil, and if you don’t want to modify the integrity of your board, a solution that connects the motor cable going from board top to mast is still to be found.
I would prefer foot hooks on suction cups, like that your ankles are safe in case you fall
Retro fitting SupFoil boards is a huge market ( @VeFoil one for you in 2019)
Imagine a company that would provide a dismountable plug and play efoil kit:
electric box on suction cups to fit to the back of the board
cables hidden inside flush rails (from electric box to board tail, from board tail to mast plate, from mast plate to pod).
pod
Nice and easy, totally hidden complexity : no hole in the board or mast (1), no visible cable, no screw just sticky tape (rare or none), five (100 to 150 mm according to mast chord) adjustable (+ 0 / +10 mm) pods with sticky foam to adapt to any kind of mast
(1) possibly a notch (but not a hole) on the mast trailing edge to maintain the pod vertically.