Found this 4x6ft 1/4” thick rubber mat at the Home Depot for about $30. Flipped it over so the flat side is up and have been using it with the rack and
Gym Rubber Flooring mat, 12mm Thickness (6ft x 4ft) Heavy Duty Large, 25kg | eBay
IncStores 1/4" Thick Tough Rubber Flooring Roll | Flexible Recycled Rubber Floor Mats for Home Gym | Heavy Duty Rubber Mat for Home Gyms, Sheds, Horse Stall Mat or Trailer | 4'x10'
Rubber Truck Bed Mat - 6mm Thick - RAM 1500/2500/3500 - 5.6 ft Bed without Rambox (2019-Present) | Expertec Shop
Commercial equipment rubber mats 4'x6'x3/4"
Rubber Cal Maxx Tuff Heavy Duty Protective Mat, Black, 12mm x 2 x 3-Feet : Amazon.ca: Sports & Outdoors
Rubber-Cal, Inc. Max-Tuff 1/2'' Rubber Mat & Reviews - Wayfair Canada
Rubber-Cal 03_167_W_RC_08 "Ramp Cleat" Non-Slip Outdoor Rubber Mats-1/8" Thick X 3' X 8' Floor Mat Black : Amazon.ca: Industrial & Scientific
VEVOR 12 PCS 1/2 inch Thick Gym Floor Mats, 24" x 24" EVA Foam &
Smooth Rubber Matting – Canada Mats
Bully Mat 4' x 6' Rubber Floor Mats - 1/2" - Mad Matter, Inc.
1/4" Thick Rubber Roll Matting is 1/4" Rubber Flooring for Fitness by American Floor Mats
Commercial Gym Flooring Rolls by American Floor Mats
1 Inch Thick Rubber Floor Gym Tiles(4 Pack) - 19.5" x 19.5" x 1" – Unofive
Rubber-Cal Comfort Cloud Foam Anti-Fatigue Mats - 5/8" Thick x 24" x 36" Black Rubber Mats : Amazon.ca: Industrial & Scientific
VEVOR 6 PCS 1/2 inch Thick Gym Floor Mats, 24" x 24" EVA Foam &
1/2in Thick 48 Sq Ft Rubber Top High Density EVA Foam Exercise Gym Mats Non-slip 12 Pcs - Interlocking Puzzle Floor Tiles for Home Gym Heavy Workout Equipment Flooring - 24 x
Fit Floor 4 ft. x 6 ft. Rubber Gym Mat in Grey (8mm Thickness) | The Home Depot Canada
Heavy-Duty Rubber Matting When You Think “Heavy-Duty”
Rubber-Cal "Maxx-Tuff" Rubber Mat - Heavy Duty Rubber Floor Protection Mat - Black in color - 1/2 in x 3 ft x 4 ft - 36 x 48 - Bed Bath & Beyond - 8239305