Implementing Power BI Embedded with RLS for Intranet website

I need to build a Report Environment for an intranet website to embed Power BI reports for about 100++ users. I will implement Row-Level Security (RLS) so each user only sees their data, but I don't want to create individual Microsoft accounts for everyone. Users will authenticate through the intranet, like user will sign in to the website using his/her credentials and that credential should should match with RLS so he/she can see the report they are expecting to see.
I'm thinking of getting the Power BI Embedded license for report sharing. But I'm unsure about how I can execute the development portion.
Any advice on best practices for RLS implementation in this scenario, especially regarding the development part, properly embedding the report? Also, any tips on minimizing costs while leveraging existing Power BI Premium Per User (PPU) licenses would be greatly appreciated! Open to collaboration and any insights from similar projects.
Thanks!