I shoehorned mine into a 20" stand. A tight fit, but doable. Simply mount the pump off the canister lid.
I took the pump off the 2262 canister lid (I tossed its cap and its green pump platform) and instead mounted the pump 3 feet away from the canister. I kept the 90-deg elbow coming up from the canister, but now it enters a 1" PVC flexible hose that runs horizontally to the pump. The pump is now separately mounted to the roof of my stand (using its grey platform), about level with the top of the canister lid, so it all remains self-priming during water-changes. Flexible PVC hose also runs from the pump back to the tank too.
I like the flexibility of this Eheim design. It rocks!