tempered glass is not always the best solution for samsung phones that have edge screens. I recommend looking into top sellers on Amazon such as LK or Finite. I have tried expensive spigen screen protector on my s10, but it didn't last long. while the lesser know company's product (LK) that was rated highly on Amazon, worked very well. also, tempered glass is thicker and may not go well with a case.
yup. I followed their YouTube video and everything went smoothly. once applied, you may see some lines as if they are trapped below the screen protector but after a day they disappeared.