Then I’m not sure I understand your question… Are you asking whether I’ve used the cable only version? Yes…
The Flat High Performance, at least in the US and Canada, requires that you use the provided Starlink power supply. It does come with an ethernet cable which you can use to connect it to a router, but you still need the Starlink power supply. You don’t need the router.
I did an overview of the Flat High Performance dish at Starlink flat high performance in-motion dish initial impressions
There are a number of folks who have figured out the pinouts to the dish and gone as far as trying to provide PoE power without the Starlink power supply, but at 320W of total power, that’s going to be a pretty specialized or at least industrial version of a supply - different than the hacks that a lot of folks have done for the smaller dishes.