Fork Standoffs are the perfect part of the utilization of mounting panels perpendicular to each other. You can have a through-hole on one piece of material and allow a side grip on the other material. They allow you to do two vertical pieces or one vertical and one horizontal on the piece's orientation.
Comes in Acrylic, Aluminum, and Black.
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Sneeze guards, partitions and barriers can be made using Fork Standoffs and cut to size acrylic up to 5/16" thick. They can be made in many shapes and sizes with side supports of all shapes and heights. The side support needs two 1/4" holes for the fork standoffs to mount them to the center panel.