Or along the floor, ceiling, etc. You could have them crisscrossing eachother, going straight, one spinning circles vertically by going along the wall, onto the ceiling, onto next wall, onto floor and repeat.
You could build some really harrowing hallways by doing this. Narratively dodging them be something out of a movie as they blades whirl past you and eachother and others pop up just as you pass, etc.
Now to have that many you would need to add more Whirling Blades, but that is certainly doable with the level of XP it is.