Personally, I have a variety of practice locations.
But I don't have a net. I wish I did. I agree with the O.P. that a net can be a valuable tool for working on mechanics. I've also found and used them at tournaments, to loosen up without having to chase down my discs.
A few places, I've found a steep grassy hill next to flat ground that I can throw into, with almost the same result. Though it probably looks odd, ripping discs full speed right into the ground.