I've had bad experiences with those repeaters, but never used the RJ45 backed ones. IMHO, that is then the same as an AP though - except for maybe sharing the same network SSID.
The best / cheap solution for great wifi is to purchase additional cheap ones, disable the dhcp server and drag lan from one to the other. (AP mode I guess.)
Lounge, Office, Bedroom for example. Connect your devices to each at least once and then forget about it as it'l switch over.
Of course if you have money, you could do the same but using MESH/Mimo.