Depends in size if company somewhat, most small to medium size local companies wouldn’t stretch past 60k a month .
Bigger or international companies might pay more.
Solid experience and reputation along with contacts will equal more pay.
I tgink I got got 55k/mth in my first product mgr job 17 years ago here . I kind of plateaued at 60-70 for a few years because worked for start ups and small distributors . Then to 90 and upwards in bigger organisations . To get the bigger money you need to get a regional role or senior management role usually . Salary scales in Taiwan are low . That is a real problem . Many just find a comfortable job and go with the flow (locals and foreigners alike). Senior managers in some companirs get paid just get 50 or 60k a month . That is the truth.
In other companies with large revenue they could get a lot lot more.
Now you can sometimes get lucky and find a more generous employer or somebody who sees that can you bring in some decent revenue .
Shoot for higher than you will accept and then you won’t be disappointed if you don’t get it or feel like you were low balled.
Advise you to accept a salary that’s close to your expectations but focus on getting into a fast growing industry or a big organisation with regional roles.