One of my favorite parts of renovating is running new pex. Some people prefer branch systems, but personally I'm in the home run camp. What that means is that every fixture gets a direct line from a manifold to the fixture. This ensures that everything gets the same amount of water, you minimize joints which minimizes points of failure and in the case of hot water you'll waste less and typically wait less for the hot water to flow.

Shower Valve Body - https://www.amazon.com/gp/product/B00...

Diverter - https://www.amazon.com/gp/product/B00...

Shower Trim Kit - https://www.amazon.com/gp/product/B06...

Diverter Trim Kit - https://www.amazon.com/gp/product/B06...