Will this fit over a heavy duty extension cord?

Yes. I have a thick yellow cord from a heavy duty outlet strip going though it.

How do you hold the cover down to hard floor?

Many thanks for your interest in D-Line Floor Cord Cover, they are made from a flexible material which simply uncoils to lay flat (with no need for adhesive tapes). If you would like to secure with double sided tape you can, but it's not essential. Should you have any further questions please let me know, D-Line

ASIN	B09M8M7NST
Best Sellers Rank	#274,698 in Home Improvement ( See Top 100 in Home Improvement ) #3,258 in Electrical Cord Management
Brand	D-Line
Brand Name	D-Line
Colour	Brown
Country of Origin	USA
Customer Reviews	4.6 out of 5 stars 2,382 Reviews
Enclosure Material	Polyvinyl Chloride
Installation Type	Freestanding
Item Dimensions L x W	182.9L x 6.1W Centimeters
Manufacturer	D-Line
Manufacturer Part Number	11212
Material	Polyvinyl Chloride
Model Number	11212
Number of Pieces	1
Product Dimensions	182.9L x 6.1W Centimeters
Style	Protector,Flexible
Style Name	Protector,Flexible
UPC	818165016435
Unit Count	1.0 Count

D-Line 6ft Floor Cord Cover, Floor Cable Protector, Extension Cord Cover, Protect Wires & Prevent Cable Trips, Cable Management Solution - Cord Cavity = 0.63" (W) x 0.31" (H) - Brown

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