If it’s on private property then there isn’t a lot the government can do.
That’s why you request assistance from the private sector. There are a lot of bad-ass American patriots who enjoy the occasion “working” with the barbarian progressives.
If they put a big electric fence around it, it could become a giant “bug-zapper” for antifa types.
It makes you wonder why people who like Confederate statues don’t simply erect them on private property in prominent places. You get your public statues, and take away the power from city councils and Democrat politicians to remove them.