From my experience, power line adapters are very hit or miss depending on your house setup. I've had power line adapters that couldn't even get above 10 Mbps. I feel like the next best thing besides just straight up Ethernet cables is something called MoCA adapters. They use the already existing (in most houses) coax cables, which allow for much higher throughput and very consistent connection. I've had peaks of 850-900 Mbps with 10ms latency using MoCA adapters.
These streaming companies are giving people more of a reason to use Jellyfin every day