This collection comes with a base plate that mounts to screw holes on the top of the F450 frame.  Additional plates can then be stacked using common m3 spacers as seen in the photos. I use m2.5 thermal inserts for all screw attachments. 

- The plates in this collection include

• Base plate
• Generic Pixhawk mounting plate
• 915 MHz telemetry radio mounting plate
• Generic M8N GPS mounting plate
• FlySky fsi6 receiver mounting plate