Meters sending a signal are certainly no more hazardous than anything else sending a signal. Some use a sort of radio system, others use a wireline signal within the electrical system. You may see boxes mounted to poles every mile or so that gather and repeat the signal.
Got in a tussle with my utility a while back. Meter had been reading fine for years, then for some reason it stopped. They started sending meter readers out. High dollar/hour line field supervisors. I have gates, so they couldn't get in. They started hassling me over it. I put up a fuss. Like others in this thread have noted, we used to either send a card in or just call the meter reading in each month. I tried to get them to accept that again. They refused. I offered to email a picture of the meter so they could read it that way. They refused. They tried a new meter. It didn't work. A second new meter didn't work. Finally, after about 4 months or so of messing around, they tried a different brand of meter that sent a stronger signal down the line. That's been working fine for a couple of years now.
I put a web camera outside facing the meter so I can read it daily and record it on a spreadsheet. I use it for personal silly reasons of curiosity to try and keep my usage down. But I now have several years of daily readings, so if something starts going nuts and reading high, I can print all that out to support a complaint.
My understanding of 5G is that it travels less far. Higher frequencies, lower power, less distance, so more microtowers will be needed. LOTS more. I've read that they may be every few hundred yards in some urban places to get full coverage and handle the increased traffic. Advantage is that they'll use monopoles instead of the elaborate cell towers now blocking the view. In rural areas, they may use 100' utility poles within the same right of ways.
I'm not sure if or when they'll start removing the existing metal towers or what will happen to the property leases.