Where was the Maniac Cop film series filmed?

The Maniac Cop film series has 3 titles (1988 to 1993), filmed at 2 places in 1 country. Wikipedia names 4 more. Every place links to its source.

The productions, in order

Every filming location they used

Each place appears once, even when several titles were filmed there.

Named in Wikipedia's own articles

Places named only in the titles’ Wikipedia articles.