Not sure about the mountains, but IMHO, all language schools currently operating in Taiwan are created just about equal, they are endowed by their Boards of Directors with the same textbooks for the most part, and the teachers are just about equally trained. (See voluminous other posts about this – won’t bore you just now.)
Pick the school that:
a) is the cheapest, or
b) is the most geographically convenient, or
c) offers the hours you want.
What you need is to acquire the core vocabulary WELL – I mean stuff that is used no matter what you’re talking about. After that, you can start to head in the direction of whatever you want to be able to talk about particularly well later on.
I would NOT spend the time, effort and money on Shita considering that there are other schools available, UNLESS you specifically need the visa/ARC support that only a university could give.
The Fujen program seems to be pretty much like any other one, but if Hsinchuang is your thing, it’s worth considering, I suppose, if you want a univesrity program. At least the campus is attractive. I have offered to give a (free!) course this summer to let them see the new methods in use – we’ll see if they take me up on it or not. The Dean of the College of Arts and Sciences was interested, but…who knows.