Ethernet of powerline adapters a very YMMV situation. Occasionally, it works great for people, but more often than not, the performance is poor and/or unreliable, especially in countries with split-phase 120/240 volt power (where good performance relies on choosing outlets with hots on the same side of the center-tapped neutral. The people who most commonly share success stories with powerline Ethernet are residents of the UK, where houses only have 2 wires coming in from the pole and there's often a ring main system where an entire floor of a house will be on one circuit.
A better solution is repurposing unused 75Ω coaxial cable with MoCA 2.5 adapters, which will actually give you 1+ Gbps symmetrical. The latency is a very consistent 3-4ms, which is negligible. I use Screenbeam (formerly Actiontek) ECB6250 adapters, though they now make a new model, ECB7250, which is identical to the ECB6250 except with 2.5GBASE-T ports instead of 1000BASE-T.
> A better solution is repurposing unused 75Ω coaxial cable with MoCA 2.5 adapters
I'll second this. MoCA works. You can get MoCA adapters off Ebay or whatnot for cheap: look for Frontier branded FCA252. ~90 MBps with a 1000BASE-T switch in the loop. I see ~3 ms of added latency. I've made point-to-point links exclusively, as opposed to using splitters and putting >2 MoCA adapters on shared medium, but that is supported as well.
That was my experience too. The experience with powerline ethernet adapters was unbearable on a daily basis.
We had an unused coax (which we disconnected from the outside world) and used MoCA adapters (actiontek) and it's been consistently great/stable. No issues ever... for years.
A better solution is repurposing unused 75Ω coaxial cable with MoCA 2.5 adapters, which will actually give you 1+ Gbps symmetrical. The latency is a very consistent 3-4ms, which is negligible. I use Screenbeam (formerly Actiontek) ECB6250 adapters, though they now make a new model, ECB7250, which is identical to the ECB6250 except with 2.5GBASE-T ports instead of 1000BASE-T.