What web monitoring service will be able to do what is described in detail?

Question

Parsing

Interested in the service for monitoring changes (code, text, meta) on the pages of the competitor's site or the possibility of writing it.
I selected several services:
seosan .io
websvodka .ru
spy.sorge .pro
SE Ranking
But the question is that none of them satisfies my requests, namely:
I have 20 sites, for each site there are 5 urls for which I need to track 10 competitors. Let's say the 1st site is called Scales, it has the category Laboratory scales, which has 10 competitors.
Next category: Analytical scales and also 10 categories, the hierarchy or structure is as follows:
Scales - Lab scales - 10 urls of competitors
Libra - Project, and it should contain folders with the name of the pages for which changes are monitored on the pages of competitors.
Let's agree that these are 500 different urls every 3 days

Answer 1

order on freelance for yourself, it's not some trivial task to parse hundreds of urls of different sites with different layouts, etc.