White Board Joints for Shared Display Design

I've designed some joints that connect and support a pair of dollar store white boards. The white boards remain intact with no extra hinge screws put in them and reusable as they are, but they're also linked as one corner-style display unit this way, and there's a small table that fits on the top joint to show off your board games sign, business card selection, QRL code offering, or whatever else you might want someone to see. These joints should work on longer and shorter white boards so long as they're 0.75 Inches in depth