We bought our WiFiRanger Osprey Category 12 in April 2022.
Our travel trailer had Winegard Air360+ V2 pre-installed. It has an omni directional TV and FM radio antenna, a single 2.4 GHz Wi-Fi antenna, and two cellular MIMO antennas, all wired through the roof. The TV has a 12VDC signal booster installed by the TV. 12VDC power with wall switch pre-wired. We selected the Osprey with the category 12 MODEM when it became available as it supported more bands. I am not clear on the Air360+ versions other than the V2.S has an external satellite connector and assume the RV manufactures would pre-wire the additional cable for it. The Osprey kit included the unit, base plate to mount to the ceiling, power connector, SIM card, and instructions. When connecting be sure to confirm the voltage and polarity of the prewired power cable.
The AT&T $50/month for 100 GB prepaid hotspot plan was only available online. The price was double if you went to an AT&T store to set it up. We signed up in April 2022 at
https://www.att.com/prepaid/mobile-hotspot-tablet/. I do not see the $55/month for $100 today but you might try the chat on the page to see if it is still available.
I did not read WiFiRanger's instructions on setting up the Osprey with AT&T or T-Mobile and tried to use the included FreedomGO SIM card to set up the AT&T plan which would not work. I did have to make a trip to the AT&T company store to get a new SIM at no cost. After that I had to get AT&T Prepaid telephone support to help clean up my mistake for not following WiFRanger's instructions. If talking to AT&T support use the keywords "WiFiRanger" and "is supported" as not all the first level support will understand. Also, they may ask about information displayed on the device message screen, but you will have to explain there is none and there is no way to see messages from AT&T. You need to connect to the Osprey's web interface to see connection information as well as to help troubleshoot. Another thing to note is the Osprey startup and connect time is longer than typical hotspots.
I understand that Osprey is only 4G LTE. This has worked well for us in MO, KS, OK, AR, TX, NM. We use it to connect our laptop, two cell phones, two tablets, and to stream two Roku TVs. The Osprey does support 5 and 2.4 GHz Wi-Fi with internal antennas and only 2.4 GHz with the external rooftop antenna.
Our truck and Gamin GPS are set up to connect to the Osprey when traveling. Between the Osprey with AT&T and our Verizon phones we can connect without problems where we travel.
I have used my Android OS phone as a hotspot and USB connected to the Osprey just to know it would work and have connected the laptop to the single Ethernet port also.
We have used the Osprey to connect to RV park Wi-Fi also, but some park Wi-Fi service will not support streaming. Before we sold our house, I connected to our home Wi-Fi to know it would work.
All this may seem like a commercial for WiFiRanger and Winegard, but it is our experience, and our setup has served us well. We did full time for 6 months looking for a new home after retirement, so we were not dependent on the setup for work. During our travels we did meet people using Starlink for work but never asked about their backup connections. We do not have Starlink so I cannot write of its connectivity to Osprey other than what I have read from WiFiRanger and online.
I know docj can provide expert advice and details.