I believe you're currently using the stock TVOS PIP integration, but I hate how the PIP window moves around on the screen when using navigating in the guide.
Would be really nice to have the PIP just "stick" in a single location. I know other TVOS apps can do it (check out IPTVX as an example) - I believe it just sticks in the upper right-hand corner, above the guide. Only downside would be I imagine that would potentially cutoff some of the show description on top but imagine that could be tweaked. It would just look way more professional vs. the "bouncing around" that it currently does.