I added this to a 2 node system due to some supposed coverage issues but it didn't really help and I guess some devices can't determine , which node to use. Additionally, Velop has some acknowledged issues with some devices and is plagued by trying to find solutions with no real solution. Read their forums before buying. But it's easy to install and set up, and it stays connected.
AmpliFi HD WiFi System: Whole Home Coverage, HD Router, 2 Mesh Points
33 Review
Tenda Nova Mesh WiFi System (MW3) - Complete Whole Home Coverage, 1-Pack
25 Review
Get Superior WiFi Coverage with TP-Link Deco X20 Mesh System πΆ - Covers 5800 Sq.Ft, 6 Ethernet Ports, Wired Ethernet Backhaul Supported (3-Pack)
19 Review
Signal amplifier Tenda nova MW6-3 AC1200 Home Mesh WiFi system with 2 Gigabit ports. By
20 Review
π StarTech.com NETRS2321P: 1-Port RS232 to Ethernet IP Converter, Serial over IP Device Server - Black
5 Review
π CERRXIAN RS232 to Ethernet Serial Device Server - TCP/IP Converter with 1Port DB9 RS232 Serial to Ethernet Connectivity
3 Review
π StarTech.com NETRS232 Serial to IP Ethernet Device Server - DIN Rail Mountable - Serial Device Server - Serial Over IP Device Server (Black)
4 Review
HB-UMLS Sabrent USB 2.0 Hub with 4 Ports and LED Power Switches for Each Port
12 Review