Yeah sure why not, front view sensors are also available in market, you must have seen them.
but here i am saying on a single device you cannot use sensors at different places..
let me try to explain..
A box of sensor contains two main parts that is sensors and device.
sensors are fixed at bumpers while device tells us the distance between car and object.
The device power is connected through the reverse light (same as your rear view camera), this means when you put the reverse gear the sensors become active, and when you take out the reverse gear the sensors goes deactive. you may already know this, offcourse..
so here my point is while driving the car how will you activate the sensors.. oh by giving direct connection from ignition, okay....! but how will you know that the sensors are showing the distance between the car and object is of front or of rear..?
hope you get my point..! i am not saying i am right but to my mindset i know this. 