In the concrete jungle, the 1st device is enough for about 35-50m2 without significant signal loss (input 200Mbps, through 3 concrete walls the second block gives 180Mbps, without it - up to 20Mbps).
AmpliFi HD WiFi System: Whole Home Coverage, HD Router, 2 Mesh Points
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Tenda Nova Mesh WiFi System (MW3) - Complete Whole Home Coverage, 1-Pack
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TP-Link Deco X60: Ultimate Whole-Home Mesh Wi-Fi3-Pack with WiFi 6 AX3000
19 Review
Wi-Fi router Keenetic Air (KN-1613), white/grey
26 Review
π CERRXIAN RS232 to Ethernet Serial Device Server - TCP/IP Converter with 1Port DB9 RS232 Serial to Ethernet Connectivity
3 Review
HB-UMLS Sabrent USB 2.0 Hub with 4 Ports and LED Power Switches for Each Port
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π StarTech.com NETRS232 Serial to IP Ethernet Device Server - DIN Rail Mountable - Serial Device Server - Serial Over IP Device Server (Black)
4 Review
π StarTech.com NETRS2321P: 1-Port RS232 to Ethernet IP Converter, Serial over IP Device Server - Black
5 Review