Can't figure out how to make a weekly schedule table for multiple Employees

I want to convert a very rudimentary table I made for a weekly schedule for multiple employees, I did it manually by just changing colors and merging the headers, but when I need to move things around, the formatting always messes up, is there a way to create a table in this type of format?

My main issue is that Google Sheets doesn't allow to merge Table headers, so I can't just convert this to a table, so I'm stuck.

Any help is appreciated, thanks!

https://preview.redd.it/84vctmk8rj6e1.png?width=1990&format=png&auto=webp&s=0d70e3cc494e2eb99a2f43647722db5087f245d3