Runcam HD2, Foxeer Legend HD or similar style camera protective cage with standard 30.5mm FC mounting spacing.  The kit includes two side plates and one top plate which can easily be swapped in/out between your regular top plate with just four screws.  The cage was designed to hold the camera down using zip tie which provide tight enough fit to take nice clean video and yet will break off and allow for some forgiveness on head-on hard impact.  Two mounting angles are possible ~35deg/~45deg.  

In addition to the three plates, you will need to buy M3 40mm spacer (not included in the kti) to complete the build.  I bought mine from ebay.  I use 3 40mm spacers on my build.

Sample video below.

https://www.instagram.com/p/BHXv2o5B7cn/?taken-by=snokefpv