How many in one house

I order two sets that arrived today. Can I use all four in the house with one connected to the router and the rest around the house? So far I have only been able to get two working so far. And the two that are, the performance is less than stellar in a 4 year old house with no 2.4ghz interference

Thank you

2.4 GHz doesn’t mean anything…  The LiveWire is NOT “Wireless…”