Best option for hanging microwave

To all of you experts out there, what is the best option for hanging a microwave?

I have seen the microwave cabinet/shelf, but it seems that may stick out too far.

I have seen others extend a cabinet away from the wall with 2x4s and then, I assume, use that extra depth for the microwave and somehow construct a shelf for a microwave underneath a standard cabinet.

I have a 14" microwave and would like the cleanest, most custom look possible and appreciate any advice.