All the quickstrut assemblies I see in a quick search come up as interchange matching the base model Fiesta, not the ST
If that’s the case, I would highly recommend against it, especially if you’re replacing one nor two for some reason. The spring rates and damping will be softer and won’t match the ST, nor will the ride height match.
Spring compressor really isn’t that much of a big deal as long as you are using it in a safe manner. You can even rent one at your local auto parts store for a few bucks.