It works until the vendor does a scan and shuts the SIM off for violation of the terms of service. It’s happened more than once to a buddy the has bought this kind of solution from shady dealers that don’t mention they are using a phone SIM.
You might want to consider the purchase of a second phone that can be permanently tethered to your router or phone. T-Mobile will definitely be able to detect usage directly in a router SIM slot. A buddy of mine purchase a couple of plans that used a SIM intended for phone plans in the router, these plans were quickly shut down by T-Mobile and/or ATT. He had no recourse to go after the shady dealers as they had disappeared.
I’d recommend a 24 non-POE switch with POE injectors for those few devices that you are going to run using POE. That way when the POE on a cheap switch dies, and it will, you don’t have to replace the entire switch. Or buy a cheap 5-port POE switch for the cameras and daisy chain it.
You might want to look into the newer tri-band devices. Usually the third band is for mesh communications but if you are not doing mesh the third band (usually a second 5G band) can be used for devices. Alternatively the 6E tri-band devices use 6G but there are very few end-user devices that use the 6g band.