The new Antenna Max is proving pretty good for me for these types of applications, especially for units like the BR1 Mini 5G that can be POE powered via their LAN interfaces.
Single UTP run up to the modem outside somewhere which is often easier to achieve than multiple RF cables and negligible signal loss from the antenna cables into the modem as they’re in the same enclosure.
Only real draw back to me are if you need to physically access the unit for any reason I suppose.