I have two different mats that I put down depending on what I am smoking. One is a 4’x4’ heavy plastic mat and the other is a 2x2 carpet mat. I have flagstone on the patio, so, the grease stains if I get it on there. These mats work to help with that and I can hose them down when I am done if needed.
I will also use a cutting board underneath the grate when I pull. Just all depends on what I’m smoking.