I noticed when looking around that most clip on fans for tents suck. They don't oscillate, and the few that do seem to break quickly. Most clips won't hold onto a grow tent pole very well either. This is my simple solution.
These fans are slightly larger and move more air, they oscillate and seem to be quite robust.
I use tablet holders for microphone stands. They grip the tubing and the fan base very well.
They don't take up much space in the canopy and zero floor space unlike a tower or pedestal fan.
The turning radius is much more manageable than the big 10 or 12 inch fans
You can even tuck them below the canopy if you need to.
Just something I thought I would share. I've been using them for awhile now and they seem to work pretty wel