Based on the video provided in this post, you’d likely be happier with one of the Jianken (high-end Chinese) spindles “discussed” previously in the thread. Personally I’d opt for the 1100W Italian Technomotor because it supports ER20 collets and should have more than enough power for the Shapeokos. You’d need 220V for it (and most other spindles), but as others have pointed out you probably already have it somewhere (at least at your service entrance panel/meter).
As you know a 15 Amp 110V circuit is capable of providing 1650 Watts, more than twice the power of the 800 Watt spindle - so don’t sweat that. In fact, the VFD would produce less EMI at the lower voltage. The better 220V VFDs have EMI power filters because of that. Note that the Shopbot Desktop Max uses a “1 HP” Italian HSD spindle powered by 110 V.