can I change to a DP34 without having to plug into an outlet?
YES :)
Will a DP34 still let me use a separator at my dual tuner DVR's?
NO :(
If you add a DP34 AND the 3rd receiver, you will need 2 DP34s. You will need 2 runs to each dual tuner plus 1 run to the 301 for a total of 5. You will...