What is better silicone or medpor cheek implants? Is it possible to use more than one screw to fix the implants?

Hello, So I am interested in getting cheek implants and I would like to get custom made ones. At first I wanted to get medpor but I am scared of the complications because I saw a lot of surgeons saying that they have a high infection rate. So now I would like to get custom silicone cheek implants but I am scared that they can move if they are not screwed so I would like to know if it is possible to use more than one screw to fix the implants? I am still unsure about what material to use.Help me