such……that和so……that

such后面能 跟复数名词 ，但固定搭配 so many因此用SO
例如，there are such good films that I can’t miss

What you said is right.
As a rule,"so" is used before adjectives or adverbs."such" is used before nouns.If the noun is single form,the structure is " such+a/an+noun(sing).If the noun is plural form,the structure is"such+noun(pl)". But there are exceptions. When there are such words before the noun as many,much,few,little(少）,"so" is often used.This is one of the rules.
Here"such" is used in front of plural nouns,but there is the word "many",so we should use "so" instead of " such" here.

Where the noun is followed by " many/much/few/little,so is used.

这里little指少，不是小，如a little boy,就不用so

so...that中的so后面是接形容词
such...that中的such后面是接名词或名词词组

so后+形容词或副词,such后+a/an+名词
特例：many/much前面是so

many people in the zoo 是一个宾语词性的词组，所以应当用so