walls and materials

Trying to get into interior design with ue5, but after many search still dont know what is best way to make walls, few questions:

  1. is snapping 2 walls(boxes) better or do i extrude ?
  2. how to prevent/reduce noise in corners
  3. how to make materials to be on all walls with same texture cords ?

so i extruded 1 wall but materials dont transit seamlessly from one side to another shown below

  1. Separate walls is better for lighting

  2. Try tweaking Lumen params

  1. Use a world aligned texture