There are a couple of solutions but I used SlipLo Ultra.
sliplo.shop
In my case I was only scrapping the center section and each section towards the sides where the splitter bends down then up. One box is more than enough. I only used 2 sections. One full section in the middle and 1/2 section on each bend point. I also did it with the car on the ground. Our splitter has a front lip 3/4 of an inch deep. The SlipLo is 3/4 of an inch so I cut off a bit over an 1/8th to make it fit properly.

SLiPLO Universal Bumper Guard Scrape Skid Plate Protector Kit
One size fits all bumper scrape guard protection kit designed to protect virtually any car from steep driveways, parking curbs, potholes and speed bump damages.

In my case I was only scrapping the center section and each section towards the sides where the splitter bends down then up. One box is more than enough. I only used 2 sections. One full section in the middle and 1/2 section on each bend point. I also did it with the car on the ground. Our splitter has a front lip 3/4 of an inch deep. The SlipLo is 3/4 of an inch so I cut off a bit over an 1/8th to make it fit properly.