homeplug既原理係咪router其中一個lan出一條線去第一個homeplug --> YES
跟住另一隻homeplug就插去近房既牆身插頭 --> YES
兩隻homeplug之間係用電網去傳送wifi信號 -->NO, you have to buy a HomePlug with Wifi to act as a Wifi-Extender.
所以近房既homeplug位置係唔使收到wifi? --> I do not understand your question.
而通常宜家d homeplug都係一pack兩個? --> Yes, it is
最後請問$500左右有冇homeplug介紹? --> I used to NETGEAR Homeplug and it is a reliable brand.