I’m trying setup two reolink cameras for my sister. I was looking at tp-link switches (one for $40 said p76 batteries required? And another for $50 didn’t mention those at all) should I get that or would two injectors be better? She got two cheap injectors but they were 24v and not the 48v that they require. I was hoping to run two 10′ cables from the roof to a switch/injectors and run one down to the router (which I’m going to have to move to a better spot.) Thanks in advance.