If we're going to get in the weeds of category cabling, I'd demand the contractor
not use "EZ-RJ45" connectors. They're quicker for the installer, but these connectors are known to introduce crosstalk across the conductors. This will cause intermittent problems that can make you and your installer nuts trying to troubleshoot issues. I've had contractors have to literally put new traditional RJ45 connectors on an entire job because they were losing their shirt in troubleshooting and dealing with upset homeowner.
https://www.platinumtools.com/produc...45-connectors/