can this be mounted on the edge of desk (to be level with desk) with screws through the cable holes instead of mounted underneath desk?

It shouldn’t be a problem. The only issue with mounting with the screws is to make sure they don’t split the wood.

Is it suitable for thicker hdmi cables?

yes, i thought this is quit suit for my computer desk,there are many kinds of cable wires,it didn't Stuck because the hole is big enough to take my messy computer wires.

ASIN	B08R75RMQT
Best Sellers Rank	#3,630 in Electronics ( See Top 100 in Electronics ) #51 in Cable Raceways
Brand	ENONCI
Color	Black
Customer Reviews	4.5 out of 5 stars 1,669 Reviews
Enclosure Material	Polyvinyl Chloride
Installation Type	Screw In,Self Adhesive,Tabletop
Item Dimensions L x W	15.4"L x 1.6"W
Manufacturer	Sunshow
Material	Polyvinyl Chloride
Number of Pieces	5
Product Dimensions	15.4"L x 1.6"W
Style	Custom
Style Name	Custom
UPC	797059456345
Unit Count	6.4 Feet

Updated Cable Raceway Kit - 77 (5x15.4) Inch Open Slot Wire Covers for Cords, Under Desk Cable Management System to Hide Under Desk/Tv/Computer/Net/Power Cords, (Pack 5)

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