Watch MythBusters. The guys took out 5 magnetrons from (duh) 5 microwaves,
aligned them all to "air at the same target in a makeshift microwave. As
they measured the microwave radiation from different points, what they
recorded was in fact startling to them. The microwaves cancelled each other
out. The likelihood of the magnetrons starting at the exact same point of
the sine wave is very slim. The misalignment of the waves as they converge
causes a disturbance to the individual waves in turn reducing the overall
"effectiveness" of the microwave radiation.

Wow... I suggest that you find someone who (A) you trust, and (B) who
can reasonably be expected to know something about the subject, and have
them explain to you the many things wrong with that.

--Goedjn