Dose this absorb the sound and shock of the treadmill because I’m in the second floor and I have neighbor underneath that I don’t want to annoy?

Perhaps a little but I wouldn't count on them being noise/shock proof.

Do I need a Mat also to protect a carpet or will these do the trick by themselves?

Not necessarily, BUT I got a carpet protector plastic mat at out condo because as you use the treadmill you will wear the belt very slightly along with you shoes & there will be dirt building over time at the rear of the treadmill -- requiring occasional vacuuming. We did not use the treadmill mat pads at our condo (primarily bought these as the treadmill at our home on concrete would slowly creep backwards without them).

Are these waterproof? Do they absorb water or create molds when soaked in water?

They really do not absorb water since they are very hard rubber but if they are in water for a period of time they should be dried because I believe there would be a chance for mold.

ASIN	B07N5HZR6N
Assembly required	No
Batteries required	No
Best Sellers Rank	#3,866 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #15 in Exercise Equipment Mats #18 in Exercise Mats
Brand	BestXD
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (2,997)
Included Components	mat 3.94" x 3.94" x 0.5"（4PCS）
Is Discontinued By Manufacturer	No
Item Thickness	0.5 Inches
Item Weight	4.9 ounces
Item model number	XD-Mat-C6
Manufacturer	BestXD
Number of Items	4
Pattern	Black background with blue dots
Product Care Instructions	Hand Wash Only
Product Dimensions	3.94"L x 3.94"W x 0.5"Th
Special Feature	Anti-Slip
UPC	075331852567 753318525672
Volume	7.32 Cubic Inches

Treadmill Mat Pads, Exercise Equipment Mat with High Density Rubber for Prote...

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