Grill Cutout Kit vs a Grill Platform kit.
A Grill Cutout Kit creates the opening for the grill to slide into
A Grill Platfrom Kit creates a shelf for the grill to sit on.
Most grills are counter top supported and do not require a platform. Brands include: Fire Magic, Bull, BBQ COACH, Blaze...
Some grills require both a grill cutout kit + a Grill plat form kit
Brands include: DCS, LYNX, VIKING...
Check your grill owner manual or ask the dealer who sold it to you.