Megan Fox & Machine Gun Kelly shack up in $30K per month Airbnb

Megan Fox and Machine Gun Kelly are shacking up in an Airbnb rental, estimated at $30,000 per month, in Los Angeles’ upscale Sherman Oaks neighborhood, The Post can reveal.  The affectionate, PDA-heavy couple, who have been dating since last summer, have been staying in a five-bedroom, five-bathroom abode spanning over 5,300 square feet.  Newly constructed in April,…