Side wash is good _ I usually ask guys to do that.
One band that I work with all the time and have 'em on IEM's, if the guitar player wants his old Fender real loud,I turn it around and place a foam-lined rack cover in front grill and place a cloud nine cover over the back if it is open back - then he can let it rip and it acts as an ISO cabinet - I have done this bands that are on my wedges too, and although the guitarist was not real excited about the stage mix, the FOH was excellent and all his crowd let him know how good they sounded awesome.
I, myself, play an old Marshall half stack and do the turn around thing and foam lined case - keep my guitar in my IEM's and I am all good no matter where I go -
My .02