Use Cat 6 Plenum rated wire and you'll have no problems. I used a hardwire backhaul for my mesh routers and have no issues.
Invest in a good punch down tool for the terminations and keep them neat and clean. Get or make a holder for the jacks & plugs when doing the terminations, it makes life much easier. No magic, just good workmanship.
@elliottbnewcombjr recco for sealing the penetrations is solid.
Avoid repeaters - by their very nature they halve the available bandwidth. Use mesh routers instead.
Worries about about static or thermal concerns are unfounded. Of course I only have 40 years experience with Ethernet cabling - Coax, Cat 5, Cat 6 in homes, offices, schools, and enterprise-class data centers, so what would i know?