This is the reason I prefer a clamshell to a wall-mount. Versatility.
The clamshell is the safest compressor around that's really fast (run it on & off with a 3/4" socket on your impact) to use, can be used on a bench or even on the vehicle, always runs down evenly, and most importantly, isn't a wall mount.
There are quite a few vehicles I haven't been able to get a strut to properly index into a wall-mount, or it took 10-15 minutes to halfway get it to work, if I did. Time is money in the car repair industry.
I like the clamshells because they're quite safe (Just make sure the jaws are slightly past the center-line of the coil, so it won't bow outward if it slips. That's the only trick to safe use.) ... they come as close to working on everything as possible, and they're the fastest, to boot.
I don't know if there's a US-made one... and I really couldn't care less. When it's the absolute best tool for the job, I will buy the foreign-made one without a second thought. If it were a cheap, fragile, cast design that might explode if run down too tightly or dropped while compressing a coil? Yeah, then I'd care.
This the what I'm talking about. The tech next to me owns it. Gets about a dozen uses a week, and has for 15 years straight...