Hi xion. I'm sure you've worked it all out now, but the blades have arrows around the hole in the centre which state the way the blade
should spin. And seeing as the shaft in the table saw only spins 1 way, there really is only 1 way to mount them. You can see the arrows in
one of the first pics on the last page.

On a separate note, and again i'm sure you've worked this out, the pumps generally do need some sort of airflow underneath (that's part of
the reason the tabs on the base raise the pumps slightly when mounted with the rubber. The other reason obviously being vibration). If the
acrylic could conduct heat you'd be good to go but unfortunately it's more of an insulator.

Your a smart guy though so i have faith in your decisions. I look forward to seeing more of your work