The Horis GPS receiver needs to be stuck to the top of the glareshield with high-strength double-sided tape, however I didn't want to just stick it down to the painted surface as I'm pretty sure it will just pull the paint away.
Instead I made a little mounting pad, as per the first picture below, and rivetted it to the top of the glareshield. I painted the edges matt black, and left the centre section bare where the double-sided tape goes.
It works really well, and the receiver is stuck in place very securely.
Bare aluminium mounting pad for the Horis GPS receiver
GPS receiver stuck in place with double sided tape
The glareshield add-ons: air vents, GPS receiver and Angle of Attack HUD