[pquodling]

I have a 2016 I30 hatch - I got an OBDII bluetooth gadget which can grab all sorts of info.

But... 

Where the obdii connector is, under the fuse box, it is impossible to close the fuse box door when the adaptor is installed. Has anyone seen a low profile right angle adaptor, or can suggest an alternative - It appears the car side, female end is clipped into the surrounds. I could unclip it, and let it dangle.

[CraigB]

Plenty of adaptor cables available on eBay Car OBD2 16 Pin Flat Noodle Male to Female Elbow Extension Cable 2FT 60cm ELM327 | eBay

[The Gonz]

I agree a cable is the best option, allowing you to tuck it into the cavity and close the lid.
If you opt for a second version of the lid, with slot for the OBD device, let me know and I can design and print one.

[pquodling]

I will go with the cable, but also have a 3D Printer - if you have the STL, that would be cool

[The Gonz]

I will go with the cable, but also have a 3D Printer - if you have the STL, that would be cool

But YOU have the lid, so take photos, measure or send links and then I can have a go at designing.