I installed a new Ring Floodlight yesterday on a corner of the wall of my home. I used an aluminium alloy corner bracket that fit neatly onto the Ring Floodlight mounting bracket (plastic plate). I had been looking for a corner mounting bracket for Ring Floodlight for a long time and finally found this one. Fits like a glove and looks like an original part of the Floodlight. This may be helpful for those wanting to install a Floodlight on a wall corner.
Hope this helps.