Accent on "dou1" (all) after a subject
Yes this is correct.

都 dōu is most commonly encountered as an adverb, and fits into the pre-verbal position shared by adverbs of manner (e.g. 慢慢 mànmàn). It has a stronger link in prosody to the verb than to the noun/pronoun before it, just as your Mandarin speaking friends have demonstrated.

It does also emphasise the subject, but its semantic value is different, close to English "even" than to "all", and it is still in pre-verbal position rather than than some kind of post-noun position (I don't think that really exists to be honest).

Chinese does have ways of putting "all" in the noun phrase: the use of 所有 suǒyǒu, and also the use of 全 quán to mean "whole, entire" which can be translated "all" in certain contexts. Note though that 都 is still present pre-verbally in such constructions.