Own circuit, main power, feeding it back to the grid for profit, feeding it back to the grid for free are possible options. The options come with additional costs.
In the latest round of new regulations they allowed the use of 230V Schuko plugs for balkony plants.
It's a male end on the PV side, but every of these plug-in inverters I've seen only start outputting when they get the 220V 50Hz input, so they are inert as long as they are not plugged in. As far as I know they always rely on the grid frequency.
If the inverter outputs when the grid has lost frequency then other inverters can respond by also starting to output. This creates a chain reaction and can generate serious currents in sections of the grid that are expected to be on outage, which is a safety hazard.
Grid-tied solar inverters, as a general rule, do not (cannot) output any power at all in the absence of grid power.
The act of plugging in a normal grid-tied solar inverter with a regular ass-plug[0] is just exactly as safe as plugging in any other electrical appliance is.
(There are other concerns, but the physical plug is not amongst them.)
It can be that simple in 240v-ish countries, where everything in a home is connected to the same two transformer taps outside.
Just install a dedicated branch circuit (or otherwise isolate it so that nothing else is using that branch), plug it in, and all the stuff in the house is indiscriminately somewhat powered by solar.
And...done. That's all there is.
Here in the States, things are a touch more difficult: Our normal residential power is 240v, but our regular branch circuits (and outlets) are 120v by using a center tapped secondary winding on the transformer as neutral.
So to power a house's stuff indiscriminately in the US with a plug-in inverter (or two) would require two different outlets that are each on different transformer taps, or a 240v outlet.
Using a singular regular 120v outlet in the US will only cover about half of the regular stuff in a house, and will never be able to power any 240v loads.
(And, yeah, we have standardized 240v outlets. But they're almost never found in a home except behind major appliances like the clothes dryer and/or electric range. We also have standards for smaller outlets that would be suitable for small appliances like a toaster or a kettle, but they're almost non-existent in the wild.
It'll be a long while before we get approved plug-in grid-tied solar here.)
You think they are, but you have to trust that this happens. And even if they are, what happens if the grid is offline and comes online while the inverter is operational, how long does it take, if it does at all, to adjust itself.
If the product doesn't explicitly state this on its packaging there is absolutely a chance for competing sine waves. If this wasn't the case, transfer switches wouldn't have been invented. The original comment I replied to is simply dangerous.
In the latest round of new regulations they allowed the use of 230V Schuko plugs for balkony plants.