Using a decent twisted pair cable is essential when te distance from socket to modem is more than a few centimetres, I would not be certain about the one you have liked to however, the one ukhardy07 links to is fine being made from 2 pair Cat5e.
What you do need to be aware of is the routing you chose. What will it run past? power supplies, TVs, fridges/freezers, chargers, central heating, consumer units or large amounts of mains wiring ...
M H C
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