I’ve seen drawings of the garlic very tightly packed in a ring. If you want to harvest for bulbs I think that’s too close. I would space them out a bit. If you want to just cut for the greens, or just the scapes maybe a tighter planting.

I have planted a fairly random distribution around a tree in my yard. I can’t report back too much yet as it’s still the first year. But quite a few flopped over, if they are in a dense ring I would imagine it would become quite the mess. 🤷