Hello TP-Link Community,

I hope someone can provide some advice on this setup. I currently have an Archer AX73 router connected to my main Deco W4500 AX1500 (3-pack) via Ethernet LAN cable. The Decos are all in Access Point (AP) mode. The two satellite Decos are connected wirelessly to the main Deco, but I'm not getting my full 700 Mbps internet speed on them—it's dropping significantly.

I'd like to improve this by setting up Ethernet backhaul using powerline adapters. Specifically, I want to connect the second Deco to the main Deco via powerline, so it can use wired backhaul instead of WiFi.

However, my home's electrical wiring is old: the wall outlets only have 2 wires (live and neutral), no grounding (third wire). From what I've read, this could impact performance.

I'm considering the AV2000 powerline kit (like the TL-PA9020P or similar), but I've seen posts saying it uses MIMO technology, which relies on the ground wire for full performance. Without grounding, it falls back to SISO mode and loses about 50% speed. Some recommend sticking with AV1000 models (like TL-PA7017) since they're SISO-based and optimized for 2-wire setups.

My questions:

If I go with AV2000 despite no grounding, do you think I could still achieve close to 700 Mbps throughput for the Deco backhaul? Or would the speed loss make it not worth it?

Would an AV1000 kit actually perform better (higher sustained speeds, lower latency) in my ungrounded 2-wire environment compared to a downgraded AV2000?

Any real-world experiences with similar setups would be greatly appreciated—especially with Deco mesh and high-speed internet. Thanks in advance!