To improve quality of WiFi coverage in my apartment I bought a second Keenetic Giga router (KN-1011) in addition to Keenetic Giga (KN-1010). From my perspective Keenetic is the best router for home usage. This confirms the presence of Mesh feature that can be configured by simple wizard.
The second router was placed in second room behind 2 walls from the primary router and connected by Ethernet cable Cat 5e (1 Gbps).
Everything was perfect until I decided to play online game where I felt periodic freezes. ping shows loss of 2 packets per ~ 1 munite.