rear and above view mirror for lowboy

I tried to inflate a wing on my blackhawk lowboy PPG and found I can't see it when it is overhead. So I added a mirror. It is the biggest reducing mirror I could find in super-cheap.
Repco have them too - 140mm wide.
My mount uses four M3 screws (knurl nuts) to attach to the PPG.
There are extra screw holes so a clamp can be fitted to grab the mirror edge but initially the mirror will be attached with double sided tape. The front and mirror part of the mount are solid to reduce the air press