4G Modem for GL-AR750S-Ext that works plug and play?

I know this info is somewhere but, I swear, I did search this forum and couldn’t find anything solid, only people struggling with various ones they bought. Can anyone recommend a few models (because I don’t live in the US and what is available here might be different) of 4g (sim slot) USB modems that work with the GL-AR750S-Ext with no fiddling? Bonus for modems that are not from Huawei, if possible. Thanks!

I’d suggest that you check ROOter by Of Modems and Men

Find the “hostless” modems. Hostless modems works like tethering and should work with the stock firmware.

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I just bought a GL-MT300N-V2-2e8 and I successfully connected to the USB port a Huawei E8372h-153 wingle (wifi-USB) that is recognized as Tethering and, when connected to a power adapter, as wireless repeater. I also checked a ZTE MF833U1 (USB Modem) recognized again as Tethering. I also have an old TP-Link MR3420 with ROOTER Firmware and both works perfectly connected to the USB.