Slop.

Best to practice if you're not comfortable with an angle grinder. It really should only take a minute or two. That's short enough that you don't have to worry about cops any more than if you were taking any other approach. Cops take around 30 minutes to show up to literally anything on average.

Angle grinders are very loud. There are no quiet ways to take these things out except to climb the poles, but that's much more dangerous and takes way longer. You could compromise and do something medium-loud like use a slingshot, but it might take you 50 shots unless you're well-practiced. Angle grinders work for everyone with 10 minutes of training and practice. It's how thieves steal things that are locked up. Most of the time nobody cares or notices. This is annoying if you're being stolen from but handy if you're destroying a fascistic surveillance device.

Spray paint only works if it's within reach. These things tend to be on the top of very tall poles. Also if you're doing spray paint might as well just destroy the thing instead.

To clarify I'm not telling you that you need to do any of these things. If it's beyond your comfort zone or seems infeasible then your time is surely better spent on organizing.