If you say that a wing gives more press on rear wheels, than I will agree also it will give a little support while an jump in the air (normally we have to control this moment with throttle and brake), but it is not the sense of an wing to bring more control while driving wheelies..
My experiences with other cars concerning "Bodyprotection"... nearly nothing, but maybe smaller sizes like 1:18 or light 1:10...
Anyway, I think that there is just one way. Normally you just can use the mainframe for fixing points.
If you are think about to use the body, so you have to make also fixing points below the body to the frame.
I would not like to mount an wing on an Nero BR, but maybe the fazon design will give an option!?!?