Recommendations for parking sensors and camera for X-Trail?

[JezzabellDev]

Just purchased a 2009 X-Trail and want to fit parking sensors and possibly a reversing camera as the one we have didn't come with them. Ideally not too expensive but that work! I'm new to buying such things so have no idea about where to source so any recommendations would be great. Also any advice on fitting.

I'd be happy with a android mobile phone app for the camera if such a thing exists?

thanks