I've been using starlink mini for a couple of weeks now and it has been great. Speeds vary between about 50mb/s to 350mb/s. At first I was a little nervous b/c during setup it wasn't connecting and indicated there were too many obstacles (trying to point it to the sky between trees), but I have learned to just set it up when I arrive and it will work by the time I need to use it. If you do need to use it immediately, then typically a really large opening is needed as it looks to collect the data from about a 120 deg slice of a sphere and anything within that can prevent it from immediately connecting. But if you don't need it for about 30+ minutes, then if you have any kind of break in the trees or other obstacles, it will usually be able to make a connection. However, if the opening is on the small side you might experience some drops or drops in speed.
As far as mounting, I bought the mount from starlink for rv roofs for ~$22 but haven't mounted yet as I would rather not add screws to my roof (it does come with a sealant for the screw holes), also it lays pretty flat on the roof, so if you can't position your rv in an opening then you are screwed. I bought a short 1.25" metal pipe that I screwed into my gray-tank vent pipe and then attached the pipe-mount that came with the starlink. This allows me to rotate it in the direction of any opening around the rv for more flexibility. I think the ideal connection would be if you had a ladder mounted to your rv and run a pole along the side of it (or they even have 3rd party kits for small connectors) and then you could rotate the starlink from the ground, and potentially raise and lower it so you lower it below the wind-profile when traveling. I currently take it down for traveling, except for very short and slow speed moves. I'm nervous about the starlink to the starlink pipe-mount when driving, it seems a little loose when seated in, and I accidentally twisted it off when using screwing in the pipe to the gray-tank pipe (using the mount+starlink for additional leverage) and so I am a little worried I might have slightly compromised the mount. It did keep signal the one time I drove with it, but it was very slow travel and zero overhead obstacles. I think as long as there are no obstacles, it should keep signal at nearly any driving speed. I think I am leaning towards mounting the roof mount and keeping it there and then when I need directional pointing, switch it to the vent mount.
I went with the mini over the standard for a few reasons, and so far not regretting it.