Good stuff. I've done the same; both with computer fans and adaptors, and with cabinet type fans that can be fitted with a standard plug.
I've fit them into drilled holes in the left and right sides of the hood. If you place one with the air flow pulling in from the outside of the canopy (or stand for that matter, if you need to cool a
sump) and one positioned as an exhaust, you have a very effective cooling system that also aids in evaporation and export of moist air.
Yours seem to be mounted without the holes in the canopy, but rather with spacers, separating them from the wood, and giving them an "intake" of sorts. Do you find that efficient too? I'd rather not have holes in my canopies if I didn't need them.
Dave
