Will the multi-site structure (subdirectories) have an impact on SEO?

I currently create a multi-site structure (sub-directories), and also use the WPML plug-in to create content in different languages for each sub-site, but I am not sure if using a WPML plug-in will affect the site’s SEO?

The following are the sites I currently create as follows:
[Main website] mydomain.com/
[Secondary Site 1] mydomain.com/company/
[Secondary Site 2] mydomain.com/tw/

If I enable multi-language plug-ins on these sites and set up Chinese and English content, the URL will become as follows:

[Main website]
English version: mydomain.com/en/
Chinese version: mydomain.com/zh/
[Secondary Site 1]、
English version: mydomain.com/company/en/
Chinese version: mydomain.com/company/zh/
[Secondary Site 2]
mydomain.com/tw/en/
mydomain.com/tw/zh/

I’m a little unsure whether the site created by using subdirectories, and then enabling language directories, can clearly distinguish the differences for Google SEO. Is the overall structure good for Google SEO?`