Put a gridfinity base on Muzz64's glasses stand from https://www.thingiverse.com/thing:1264885, and boom, we've got gridfinityglasses. Holds three relatively standard/shallow frames, so it works for my readers, gunnars, and sunglasses; would need to modify for deeper frames.
On Tinkercad at https://www.tinkercad.com/things/4D4QJNwGReQ
Printed with supports only along the bottom of the baseplate.
UPDATE 9/26/2022: Added a variant that works for deeper sunglass frames; it hangs out over the front of the Gridfinity base a bit, so you'll want it to be on the outer edge of your baseplate or hanging over a minimal tray.
The author hasn't provided the model origin yet.