Indoor P5 Panel Back Connectors - Ray Wu Sourced

I could not find any designs for connecting together the indoor P5 panels that I bought (from Ray Wu) so I created these simple ones. They are for panels with a screw spacing of 16 mm in the horizontal direction and 20 mm spacing in the vertical direction between panels.

I found these brackets to be very strong and adequate for the simple 2x2 panel that I created.