Expensive, but I use an asus GT-AXE 16000 and an AX-11000 in a mesh to cover my house with over 100 smarthome devices. The routers are top end, with features galore. They auto-switch devices to the most performant connection they can support. The 16000 has a 2.5Gbe WAN port, and 2 10Gbe ports, so it’s future facing. It supports wifi 6/6e and my phone speed tests at over 1000MB/sec on it.
Liquid cooling is safe. The liquid they use is non-conductive, so even if it leaks it won’t hurt anything.
I run AIO on my rigs, 9900k and 14900k, works great. Much quieter than air.