Funny you should ask...
I have purchased my two Wally receivers as well as the USB WiFi adapters, but I don't have the service from Dish yet. (We are turning that on this week.) In the initial setup, I had no problem at all getting the receiver to find my RV's personal WiFi network and connect to it. I wish I could tell you that I've watched shows, etc., but I haven't yet. I do know that it connected and allows me to see the "On Demand" channels in the guide, while it doesn't show any other channels, simply because I haven't subscribed to any.
I believe when I talked to the Dish rep on the phone when I purchased my equipment two months ago, he told me that these adapters were proprietary, meaning if I wanted it, I had to use THEIR adapters, not a third-party. I'm inclined to believe him because I also wanted to buy the 1TB option for DVR and he wouldn't sell it to me because I could get a 2TB or larger one for less money shopping elsewhere!
Hope this helps at least in knowing that it can be done.
2020 Fleetwood Bounder 35P, Blue Ox Avail towbar, Blue Ox Patriot II brake system, EezTire TPMS system, 2021 Ford Ranger Tremor (toad)