so does your ISP router have a built in modem? Because most consumer routers are just Ethernet, and you would need a separate modem to convert from DSL to Ethernet for the router to be able to handle it. I personally have no experience with DSL so I can’t offer any advice on what to get.
it’s important to know the differences between a modem, a router, and a switch as many device have multiple in one
A modem convers an analog signal like a telephone line in dsl’s case to a digital medium like Ethernet
a router acts as a manager for a subnetwork (your lan) to bridge and firewall to the rest of the internet
A switch allows multiple devices to communicate with each other
it will run at 2.0x4 which should be plenty fast for two 10Gbps ports as it should still do 2GB/s
tho there are always a chance of weird hardware incompatibilities, soo google you motherboard and the nic