Not correct, please let me explain:
If you have valid reasons of residency (work, long term studies, taiwanese spouse…), you will be granted a resident visa. When you get your resident visa, you have to apply for an ARC.
Applying for resident visa can be done outside of Taiwan, but this would be more time consumming and more expensive than doing it in Taiwan (for example for the health exam). So I recommend doing it in Taiwan. But to do so, you will have to enter in Taiwan with a visa, so to apply for a tourist visa, first outside of Taiwan, then enter Taiwan, then change to resident visa, then apply for the ARC.
With an JFRV ARC, you can do almost any jobs (without the ones forbidden for foreigner to do), and your employer don’t need to apply for a working permit for you.
I would read carefully this post: Getting married and applying for JFRV