The DPP44, or any other switch does not connect directly to the TV. Switches are used between one or more LNBF and/or one or more satellite receivers. The satellite receiver will output a TV signal to one or more TV.
When my DP34 switch was upgraded to a DP44 a month ago, the tech connected the power inserter at my DP separator in back of my 622, that way there is a power plug close by for the power inserter. Works great!
In that given setup, you *should* be fine since both DP receivers put out enough power to juice that switch without the aid of a power inserter. With that said, I'll hold off commenting on whether I feel it's a good idea or not