My concern about the small all in one antenna is that it’s a low gain or negative gain antenna. Given the fiberglass shell you might as well mount it as close to the ceiling as possible. Clear from other metal obstructions.
An other approach could be to mount the MAX BR1 outside the RV on the roof or near the top at the back in a weather proof box (you might already have a storage compartment). If the enclosure is big enough you might get away with the stock antennas. Otherwise you have more options for connecting larger antenna’s that can be taken down (fold down) during travel.
This even opens up the opportunity to use a directional antenna to pull in even the weakest signals.