How to get Rubber on my steel plate product?

Hi there, I am producing steel 12" x 12" plates, and I want the top to have some rubber areas.

See this image as a crude example online: https://mhp.com.vn/wp-content/uploads/2018/10/xich-tai-movex-xich-tai-thep-dan-huong-gan-cao-su-1.jpg

How could I get a certain area of my 12" x 12" covered with a nice textured black rubber to provide grid for what is placed on the platform? I wouldn’t want the rubber everywhere but just in some pattern like a couple rectangles of rubber here and there - you know what I mean?

How would I even begin to do that?

Thank you