I agree - a client will have an organisational entry. Then usually a network for each location. Be that a building or town etc. This network can only contain one MX unit so keep that in mind.
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HUAWEI E8372 USB stick works great with MX64 and most APs, even Z3. I mostly use it a cellular backup. Private APN configuration is made on the modem itself and connectivity should be tested on a PC before deploying on the MX.
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