Flash for yourself to peek mid. This will blind anyone looking at that (short) corner. Players looking from far away (i.e., TT ramp) won't be blinded as much. The flash lands at a distance from the corner, so someone holding a tight angle from the right side of your peek probably won't get hit by it there.
Technique:
Aim slightly to right (about 1/3 length) of that lamp support triangle top left joint for best result. Alternatively aim straight at that joint (will land farther away from the corner)