LoL
An electric one will vibrate and walk around just as much, if not worse. Bolting the extractor down to the floor is step 1. Balancing the load is step 2.
What electric does for you is speed control and frees up the hands. An unbalanced load can be started up and set on low speed to reduce vibration while the loads in the frames even out as the honey comes out. As the heavier frames empty, higher speeds can be set incrementally. Electric also allows you to do something else while the extractor is running. Such as getting the next pail ready, uncapping the next load of frames, cleaning up boxes, etc.
On 4 frames or less, I certainly would not bother with electric. Just not worth the cost or the minimal time savings. Just bolt it down. If your shoulders are sore, take the hand crank off the shaft and attach a variable speed drill. When stepping up into the 12+ frame range electric drive becomes a must have.
Hope that helps!