Do I Need A Filter?

If you want to power that filter/amp from an external source (rather than up the feedline), you’ll need to remove an inductor or it won’t work

Personally, I think the hassle of enabling the Bias-T on the V3 is well worth the effort.
The V3 plus this filter/amp is a gratet combo, but take note of the suggestion that it is intended that the amp is mounted at the mast-head and the gain level was chosen expecting at least 3dB of cable attenuation before the receiver.