I replaced my PW microwave with the unit below ( although some like to get a convection)
once off I used paper to make a template of the screw holes and transferred to new MW, ensuring the positioning would give good ventilation.
drilled a pilot holes and installed it.
my Lexor had very limited space available- the MW fits and works well it is 700 watts which is a good load ( about 6 amps) for the wiring and the breakers in the van.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1