Just a thought- if you have the windshield that wraps around the front bars requiring minor surgery to mount side mirrors, and you have the Kymco factory mirrors, Shining a flashlight through the mirror mount holes from the cab side out will project a point of light on the side of the windshield where you need to drill a hole that will allow mounting the mirror....Using one of those newer LED flashlights will give you quite a bit of light to project onto the windshield.
Mounted mine that way and didnt have to notch the windshield....came out pretty clean...
YMMV....
FWIW, any wireless cameras that I have used have always been subject to interference, giving poor picture quality....Also, the brightness of the screen on the low end camera monitors leaves a lot to be desired in bright daylight... I have always gone to a hard wired camera which fixes the interference problem but the monitor screen problem remains....(Works great at night though!!)