Website redesign 15K pages : new URL structure and massive 301 redirects

Hi everyone. I'm restructuring an old 15K pages websites with ugly URLS.

So I'll have to make looooots of 301. Besides that, the tech team is asking to install the new wp website in a folder of the main domain domain.com/se/.

a) Do you think that I can also make a 301 redirection for the homepage (domain.com > domain.com/se/) without harming SEO?

b) Do you think that having a new URL structure with all pages at level 1 instead of 0 will lower our positions?

I'm curious to know how you...

Website redesign 15K pages : new URL structure and massive 301 redirects

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